Theta Ridge Coffee LLC

Here’s one for the roasting log: Navigating the specific thermal challenges presented by the elevated density and globular morphology of the Daterra Peaberry Collection.

The Daterra Peaberry Collection represents a curated selection from one of Brazil's most methodologically advanced coffee estates. This particular offering, comprised exclusively of peaberries from Bourbon varietal trees, originates from Daterra's "Collection" group—a designation for micro-lots scoring 86-89 points, celebrated for their exceptional traceability and cup quality. The Bourbon varietal, a natural mutation of Typica, exhibits a well-documented lineage tracing back to Yemen and its subsequent propagation on Réunion Island (formerly Bourbon). While historically appreciated for its balanced cup profile and good yield, Bourbon is recognized for its susceptibility to primary coffee pathogens such as *Hemileia vastatrix* (coffee leaf rust) and coffee berry disease, necessitating diligent farm-level pathogen management.

The peaberry phenomenon, a natural mutation where only one ovule in the coffee cherry develops, results in a single, ovoid bean. This concentrated growth typically yields a bean of higher intrinsic density and distinct structural integrity compared to its flat-bean counterparts. The pulped (semi-washed) processing method employed for this lot involves the removal of the cherry skin, followed by drying with a portion of the mucilage intact. This technique, prevalent in Brazil, contributes to enhanced body and sweetness in the final cup by facilitating enzymatic reactions during the drying phase, while maintaining a cleaner profile than fully natural processes. This specific combination of high density, unique bean shape, and pulped natural processing dictates precise thermal energy application to ensure uniform heat pe*******on and complete flavor precursor development without incurring surface defects.

# # # Roaster’s Technical Notes

* **The Charge and Airflow Strategy:**
* Initiate charge at a drum temperature range of 395°F–405°F (198°C–207°C). The elevated initial energy is critical for overcoming the thermal inertia inherent in denser peaberries, promoting effective heat transfer and minimizing initial heat sink.
* Apply low initial airflow (20-25% of maximum fan capacity) during the first 2 minutes to maximize conductive heat transfer from the drum. Gradually increase airflow (to 40-50%) as bean temperature approaches the drying phase inflection point (approximately 250°F / 121°C) to facilitate moisture evacuation and manage convective heat.

* **The Maillard Phase:**
* Monitor for the transition from a pale green to a distinct yellow hue, accompanied by initial olfactory notes of toasted hay or raw legume. This indicates the onset of the Maillard reaction.
* Maintain a steady, declining Rate of Rise (ROR), aiming for 15-18°F/min (8-10°C/min) through the yellowing stage, naturally declining to 8-12°F/min (4-7°C/min) as browning progresses. Aggressive ROR management is crucial to avoid stalling, particularly with the higher sugar content typically found in pulped natural processes, which can lead to underdeveloped acidity and diminished complexity.

* **The First Crack and Finish:**
* Acoustically, the first crack will present as distinct, sharp detonations rather than a diffused popcorn-like consensus, characteristic of a denser cell structure. Note the initiation temperature and time precisely.
* Allow a Development Time Ratio (DTR) of 20-22% of total roast time, translating to approximately 90-105 seconds post-first crack initiation. This duration supports the caramelization of sugars and the full development of chocolate and nutty characteristics, aligning with the low acidity profile.
* Target a final roast degree between Full City and Full City+ (bean temperature range of 400°F–410°F / 204°C–210°C). This degree optimizes sweetness and body while preserving the delicate fruit notes suggested for espresso applications.

https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.

Here’s one for the roasting log: Managing thermal conductivity in ultra-high-altitude, large-screen washed coffees.

Grown at an exceptional altitude of approximately 4050 meters above sea level in the Farallones de Cali region of the West Andes, this Colombian Supremo lot represents the pinnacle of traditional agricultural precision. The extreme diurnal temperature variation at this elevation dramatically slows cherry ripening, allowing the plant to concentrate high levels of glucose content within the seed.

Historically, cultivating Arabica at these extreme heights provided a natural environmental defense against pathogens like *Hemileia vastatrix*, though managing the physical density of the resulting bean requires strict thermodynamic control. Handpicked at peak maturity and processed using pristine mountain water for traditional wet fermentation, these uniform beans arrive in standard 154 lb. bags, requiring a deliberate thermal profile to pe*****te the large bean structure without imparting surface defects.

**The Charge and Airflow Strategy**
Charge temperature must be sufficient to pe*****te the dense cellular structure of this large screen size without scorching the bean face. Introduce the green coffee at 385°F to 395°F into a thoroughly pre-heated drum. Keep airflow low during the initial drying phase to optimize conductive heat transfer, gradually increasing air velocity as the bean transitions past the turning point to efficiently strip away ev***rating moisture.

**The Maillard Phase**
As the bean enters the yellowing stage, monitor sensory cues closely. Look for the distinct aromatic transition from raw peanuts to toasted malt. Maintain a steady, controlled Rate of Rise (ROR) of approximately 20°F to 22°F per minute through this zone to extend the Maillard reaction, which properly develops the internal chemistry to yield a balanced, medium body.

**The First Crack and Finish**
The onset of the primary endothermic transition will announce itself with a clear, authoritative snap. At the peak of First Crack, manage fuel application carefully to avoid an ROR crash, allowing the development to continue for exactly 90 seconds after peak acoustic activity. Pull the roast at a definitive City+ degree to preserve the soft cranberry-like acidity and refreshing cherry finish, while securing the foundational hints of cocoa.

Secure green inventory for the roasting bench here: https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.

Here’s one for the roasting log: Managing the low-density trap and diminished thermal conductivity in Monsooned Malabar processing.

The historical footprint of India’s coffee production is deeply intertwined with the devastation of Hemileia vastatrix in the late 19th century, forcing an agronomic shift toward more resilient cultivars. The modern monsooning process replicates the historic voyages of old, introducing a unique biochemical state where green Arabica beans are exposed to moisture-laden winds along the Malabar Coast. This intentional environmental exposure drastically alters the physical matrix, swelling the bean to nearly twice its size, reducing density, and modifying the baseline glucose content.

Because this structural expansion alters how heat moves through the bean, standard profiles will fail. Precision control over the thermodynamic cycle is required to unlock the characteristic profile of nutmeg, clove, cardamom, and soft tropical fruit.

The Charge and Airflow Strategy
Due to structural expansion and low bean density, high charge temperatures pose an immediate risk of surface scorching. Initiate the roast with a conservative charge temperature between 375°F–385°F. Maintain low to moderate airflow through the initial drying phase to allow uniform heat pe*******on despite the degraded thermal conductivity of the expanded cell walls.

The Maillard Phase
As the bean enters the Maillard phase, look for distinct sensory cues shifting from aromas of raw peanuts to toasted malt and warm baking spices. To develop the heavy, syrupy body essential for this origin, manage the Rate of Rise (ROR) to ensure a steady, gradual decline. A controlled deceleration throughout this phase prevents baking while allowing complex amino acid reactions to maximize the inherent sweetness.

The First Crack and Finish
Monsooned Malabar exhibits a delicate, highly subdued acoustic profile during the endothermic transition into first crack, producing a soft, muted rustle rather than an authoritative snap. Target a precise pull time of 90 seconds after the peak of first crack to preserve the delicate tropical fruit notes. Drop the batch at a solid City+ development stage to ensure the naturally softened acidity balances perfectly with the pungent undertones of pepper and cardamom.

Shop this coffee at:
https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.

Technical Roasting Profile: Ethiopian Sidama (Washed Heirloom)
Here’s one for the roasting log: managing thermal conductivity and moisture desorption in ultra-dense, high-altitude washed heirloom aggregates.

Agricultural & Botanical Context
The Sidama region of Ethiopia presents a highly diverse genetic matrix. The "heirloom" designation encompasses thousands of distinct landraces and wild mutations of Coffea arabica that have naturally adapted to specific high-altitude microclimates. This broad genetic variance provides a robust, inherent resistance to common coffee pathogens, including coffee leaf rust (Hemileia vastatrix) and coffee berry disease (Colletotrichum kahawae).

Cultivation at altitudes spanning 1900 to 2000 meters subjects the trees to low diurnal temperatures, which severely prolongs the cherry maturation cycle. This extended maturation forces the synthesis of dense sucrose reserves and a high concentration of complex organic acids, primarily citric and malic.

The wet processing method further refines this profile; after mechanical depulping, the seeds undergo a 24-to-36-hour wet fermentation to degrade the mucilage layer before being washed and dried on raised African beds. This process results in a highly uniform moisture equilibrium within the lot, but creates a physically compact, high-density cellular matrix. Roasters must account for this density, as it resists initial heat pe*******on and demands precise thermal management to prevent outer-surface scorching while ensuring core development.

Roaster’s Technical Notes
The Charge and Airflow Strategy:

Charge Temperature: Apply a high initial thermal energy baseline between 395°F and 405°F (201°C to 207°C), adjusted for batch size relative to drum capacity. The dense cellular structure requires a strong thermal push to establish an efficient heat transfer gradient.

Airflow Management: Maintain low airflow from charge through the turnaround point to maximize conductive heat transfer within the drum. Upon entering the drying phase, systematically increase airflow to evacuate liberated water v***r, transitioning the primary heat transfer mechanism from conduction to convection. This prevents environmental moisture saturation from stalling the roast.

The Maillard Phase:

Sensory Milestones: Monitor the transition from pale green to distinct yellowing, accompanied by the olfactory shift from raw legumes to toasted hay and dried straw.

Rate of Rise (ROR) Guidance: Maintain a steadily declining ROR, targeting a drop of 18°F to 22°F (10°C to 12°C) per minute through the core of the Maillard reaction. Precise control is mandatory here to fully develop the bean’s complex glucose content and precursors to the maple syrup-like body. Avoid any premature flattening or stalling of the ROR curve, which degrades the delicate, volatile floral and sweet lemon compounds.

The First Crack and Finish:

Acoustic Profile: Expect a sharp, energetic, and highly isolated acoustic snap. The physical density of the washed heirloom walls produces a distinct, resonant crack rather than a soft, drawn-out consensus.

Development Time Ratio (DTR): Target a concise DTR of 14% to 16%, equating to roughly 75 to 90 seconds of post-crack development time depending on system responsiveness.

Final Roast Degree: Terminate the roast at City+ (typically 412°F to 415°F bean temperature, prior to any sign of second crack). This retains the volatile citrus aromatics and bright acidity while providing sufficient core development to yield a clean, smooth finish.

https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.

Here’s one for the roasting log: Managing thermal conductivity and moisture desorption in a dual-density, Swiss Water processed Costa Rican matrix.

The combination of Costa Rican components from Tarrazú and Valle Central introduces distinct physical variables into the drum. The Tarrazú region features volcanic soils at elevations ranging from 1,200 to 1,900 meters, predominantly planted with Caturra and Catuaí cultivars. These environmental conditions yield a Strictly Hard Bean (SHB) morphology characterized by high organic acid concentrations and a tightly knit cellular structure. Conversely, the Valle Central component originates from lower elevations (900 to 1,400 meters), resulting in a Good Hard Bean (GHB) density profile with a more open cellular matrix and high initial sucrose accumulation.

The application of the Swiss Water decaffeination process further alters these green profiles. The hydration and subsequent carbon-filter extraction process removes caffeine but weakens the cellulosic cell walls of the endosperm. This results in a bean that is more porous, highly hygroscopic, and thermally conductive than its non-decaffeinated counterparts. When blending these two regions, the roaster faces a split-density challenge: the Valle Central component risks rapid surface expansion and early pyrolysis, while the denser Tarrazú component requires sufficient thermal energy to develop the core without stalling. Color changes are also deceptive, as the green coffee carries a darker, browner baseline hue prior to charge.

Roaster’s Technical Notes
The Charge and Airflow Strategy: Charge a 1kg to 5kg commercial drum roaster at a conservative temperature range of 375°F to 385°F (190°C to 196°C) based on a 70% to 80% capacity batch. A higher charge risks scorching the compromised outer endosperm of the decaffeinated beans. Maintain low convective airflow (25% fan speed) during the first 90 seconds to allow conductive heat to pe*****te the bean core uniformly during the initial drying phase. Increase airflow to 60% immediately after the turning point to remove liberated water v***r and prevent baking the charge.

The Maillard Phase: The transition from the baseline brownish-green to a uniform pale yellow occurs between 290°F and 310°F. Sensory indicators shift from damp vegetation to toasted grain and raw legume. Manage the Rate of Rise (ROR) strictly, transitioning into the Maillard phase at 28°F to 32°F per minute, and tapering smoothly down to 18°F to 20°F per minute. Because the Swiss Water process alters the carbohydrate composition, the bean is prone to rapid, unmanageable exothermic reactions if the ROR is not systematically decelerated prior to yellowing.

The First Crack and Finish: Expect a soft, muffled, and crowded acoustic consensus rather than sharp, distinct snaps. The diminished structural integrity of the cell walls prevents the high pressure build-up typical of standard SHB coffees. Enter first crack at approximately 388°F to 392°F bean temperature. Maintain a Development Time Ratio (DTR) of 14% to 16%, dropping the batch between 75 and 85 seconds post-initiation. The target final roast degree is City+, terminating the roast at a maximum bean temperature of 412°F to 415°F to preserve the delicate malic acidity of the Tarrazú component while avoiding the bitter notes associated with advanced carbonization of the Valle Central sugars.

https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.

Here’s one for the roasting log: Managing the moisture gradient and uniform thermal energy absorption within the Daterra Bourbon Collection. The pulped semi-washed process leaves varying mucilage residues, impacting conductive and convective heat transfer uniformity across the blend of red and yellow Bourbon sub-varieties.

The Bourbon variety, a foundational lineage of *Coffea arabica*, traces its origins to the island of Réunion (formerly Bourbon) in the Indian Ocean, introduced by French missionaries from Yemen in the 18th century. Known for its distinct cup profile and relatively high yield, its genetic antiquity renders it inherently susceptible to significant pathogens such as *Hemileia vastatrix* (coffee leaf rust), necessitating rigorous agronomic management. The Daterra Farm, situated in Brazil’s Cerrado Mineiro, operates within a biome characterized by defined wet and dry seasons, iron-rich latosols, and an average altitude of 3800 feet, fostering a predictable cherry maturation cycle. The farm’s Pulped Semi-washed process, a highly controlled method (known in Brazil as *cereja descascado* or pulped natural), involves precise mechanical demucilaging to remove a calculated portion of the mucilage, followed by meticulous drying on patios or raised beds. This intentional retention of a specific mucilage layer facilitates targeted enzymatic activity during the drying phase, enhancing complex sugar development and caramelization precursors in the final bean, while mitigating the less predictable fermentation profiles common in traditional dry-processed coffees. The integration of red and yellow Bourbon cherries, while phenotypically distinct in their pigmentation, exhibits similar physical densities and structural integrity under Daterra’s advanced cultivation protocols, typically presenting screen sizes within the 16-18 range.

**Roaster’s Technical Notes**

- **The Charge and Airflow Strategy:**
* Charge temperature: 385°F–395°F (196°C–202°C). This range provides the requisite initial energy for rapid surface dehydration without inducing immediate scorching, respecting the bean’s inherent density.
* Initial airflow: 25% for the first 2:00 minutes, maximizing conductive heat transfer into the bean’s core.
* Airflow adjustment: Increase to 50% at 2:00-2:30 minutes to facilitate efficient moisture evacuation and prevent v***r lock or external charring as internal temperatures rise. Reduce to 40% entering the Maillard phase to stabilize convective energy and mitigate erratic ROR.

- **The Maillard Phase:**
* Sensory milestones: Transition from a pale green-blue to a uniform straw-yellow, typically around 4:00-4:30 minutes. Aromatic development progresses from vegetative and toasted hay notes to initial indicators of toasted grains and early caramelized sugars.
* Rate of Rise (ROR) guidance: Maintain a controlled ROR between 20°F–25°F/minute (11°C–14°C/minute) through the 4:00-8:00 minute interval. This steady thermal progression is critical for developing the complex glucose and organic acid matrices, preventing stalling which impedes caramelization, and avoiding excessive acceleration which can lead to underdeveloped internal structure and muted sweetness.

- **The First Crack and Finish:**
* Acoustic nature: Expect a distinct, sharp first crack, often initiating around 8:30-9:00 minutes. The collective consensus of cracking will present as a brief, rolling sequence rather than a sparse, isolated event, reflecting uniform thermal pe*******on.
* Development Time Ratio (DTR) and pull time: Target a development time of 90-100 seconds post-First Crack initiation. This corresponds to a DTR of 20-22%, optimizing the balance between sugar development and the preservation of regional acidity.
* Target final roast degree: Full City. This degree accentuates the inherent chocolate, caramel, and moderate fruit acid characteristics, culminating in a full-bodied profile with a sustained, velvety finish.

---
https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.
"

Here’s one for the roasting log: Managing thermal conductivity in high-altitude, high-density washed heirlooms.

At elevations between 1900 and 2000 meters in the Sidama zone, the slow maturation of coffee cherries yields extremely dense cell structures. These landrace heirloom varieties represent some of the oldest genetic lineages of Coffea arabica, possessing natural resilience to pathogens like Hemileia vastatrix without the need for modern hybridization.

The intensive washing and triple-sorting processes utilized for this specific lot ensure strict uniformity in screen size, which is critical for consistent heat transfer within the drum. High-elevation cultivation directly impacts the bean's glucose content, demanding a precise application of thermal energy to fully articulate the intrinsic floral and citrus characteristics without scorching the cellular matrix.

**The Charge and Airflow Strategy**
Due to the profound density of this triple-sorted lot, thermal conductivity relies on a robust initial heat application to pe*****te the core. Target a charge temperature strictly between 385°F and 395°F, maintaining closed or minimal airflow through the turnaround to build necessary conductive momentum. Once the bean mass transitions from green to yellow, engage moderate airflow to efficiently clear moisture and prevent baking during the critical drying phase.

**The Maillard Phase**
As the roast enters the Maillard phase, monitor the exhaust for sensory cues shifting from sweet hay to toasted malt and raw peanut. To properly caramelize the elevated glucose content and develop the target maple syrup-like body, maintain a steady, declining Rate of Rise (ROR) of roughly 12°F to 15°F per minute. A stalled ROR in this phase will inevitably mute the complex spicy and sweet citrus aromatics inherent to Sidama coffees.

**The First Crack and Finish**
The dense structure of these heirloom beans dictates a sharp, authoritative snap during the endothermic transition of First Crack. To preserve the wild, sweet lemon and delicate floral tones without sacrificing the clean finish, manage the development time with absolute strictness. Execute the drop exactly 85 seconds after the peak of First Crack, targeting a precise City+ roast degree to balance the acidity and body.

Secure this Ethiopian Sidama green coffee here: https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.

Here’s one for the roasting log: Managing thermal conductivity in irregular, dry-processed heirloom varietals.

East Harrar, specifically the Village of Mesela, sits at a formidable 1800 meters. The arid climate and sheer lack of water infrastructure in this region dictate a strict, unavoidable adherence to traditional dry-processing methods. This produces a raw material that behaves quite differently in the drum compared to washed high-altitude coffees.

These Ethiopian heirloom varietals possess deep genetic roots, offering intrinsic resilience to agricultural threats such as Hemileia vastatrix. Because the region relies entirely on the natural process, the extended cherry contact during the sun-drying phase highly concentrates the glucose content within the seed. This chemical makeup demands careful manipulation of heat to avoid scorching the cellular structure before core development is achieved.

**The Charge and Airflow Strategy**
Approach this raw material with specific attention to thermal conductivity. The irregular bean sizing and density of unassorted heirloom naturals require a gentle thermal soaking period. Execute the charge between 375°F and 385°F, keeping airflow restricted to a minimal draw during the initial drying phase to protect the volatile sugars.

**The Maillard Phase**
As the batch progresses into the yellowing stage, expect distinct sensory markers shifting from dry straw and raw peanuts to toasted malt and dehydrated dark fruit. A controlled Rate of Rise (ROR) is absolutely critical here to fully develop the heavy, syrupy body characteristic of a traditional Harrar. Maintain a steadily declining ROR, targeting a stabilized descent of 12°F to 14°F per minute through the middle of this phase.

**The First Crack and Finish**
The endothermic transition will announce itself with a somewhat scattered but authoritative snap, which is typical of mixed-screen heirloom lots. To preserve the complex acidity and wild berry characteristics, execute the pull precisely 90 seconds after the peak of the first crack. Drop the batch at a strict City+ degree to balance the inherent wildness of the natural process with structural clarity.

Secure these Ethiopian Harrar green beans for the production schedule: https://shop.thetaridgecoffee.com/

Follow this page for weekly roasting logs and technical specifications on new arrivals.

Remembering, Honoring, and Grateful. 🇺🇸☕
Today, the team at Theta Ridge Coffee pauses to honor the brave men and women who made the ultimate sacrifice in service to our country. Their courage and dedication are the foundation of the freedoms we enjoy every single day.
As you gather with family, friends, and neighbors this weekend—whether you’re firing up the backyard grill or enjoying a quiet morning on the porch—we hope your day is filled with meaningful reflection and community.
We are incredibly grateful for our freedom, our families, and the wonderful coffee community we get to serve.
From our family to yours, have a safe and blessed Memorial Day.

☕️ Meet the Nucleus LINK Sample Roaster, a game-changer for coffee roasters and home enthusiasts.

Why the buzz?

📈 41 Preloaded Roast Curves by award-winning Sam Corra.
🧠 Density-Driven Profiling via companion app.
🎒 Travel-ready with rugged case and accessories.
⚖️ Efficiently roasts 50g to 100g batches.

Consistency has never been this portable! 🌍✨

See it: https://shop.thetaridgecoffee.com/products/link-roaster?variant=40611218128985