Bonanza Coffee

Das Almas

brazil medium-light roast anaerobic_natural catuai
maple syrupconcord grapedark chocolate

The standard Brazilian natural goes straight to the drying bed: whole cherries spread in the sun, fermenting slowly in the open air over weeks. Das Almas takes a different path. Before drying, the cherries spend time in sealed, oxygen-free tanks — anaerobic fermentation — where the microbial environment shifts completely. Without oxygen, aerobic bacteria can't survive. The fermentation is dominated by lactic acid bacteria and yeasts that produce volatile esters and organic acids that don't form during open-air drying. Compounds like ethyl butyrate and isoamyl acetate accumulate — these are the source of the Concord grape and maple syrup character. [Anaerobic processing](/blog/coffee-processing-methods-explained) is rare for Brazilian coffee: it accounts for roughly 7% of Brazilian specialty lots versus the 73% that go through standard natural drying. The flavor space is genuinely different. At 975 meters, this Catuai grows below the typical Brazilian altitude median. Lower elevation means slightly less soluble density than high-grown lots, but at medium light roast, the CGA-to-pleasant-acid balance is carefully managed. Catuai sits in the transitional group for roasting — its roast profile is variable, and the fermentation-derived volatiles add another constraint: anaerobic compounds are fragile and are among the first aromatics lost to heat. Medium light development preserves them while allowing enough Maillard-phase browning to build the dark chocolate depth underneath. The sweetness you get isn't residual sugar — sucrose is nearly 100% consumed during roasting at any roast level. What you're tasting is aroma-mediated: caramelization products and furanones that your brain registers as sweetness via retronasal olfaction. The maple syrup note is exactly that mechanism at work.
Chemex 6-Cup 90/100
Grind: 540μm Temp: 91°C Ratio: 1:15.3-1:16.3 Time: 3:30-4:30

The Chemex is the top match for Das Almas because its 20-30% thicker paper filter does something specific for anaerobic Brazilian coffee: it strips the residual oils that anaerobic fermentation produces while letting the bright fermentation-derived aromatics — the Concord grape and maple syrup character — pass through as dissolved flavor compounds. The oils, which in an unfiltered method would compete with those fruit and fermentation notes, are captured by the thick paper. Temperature is pulled to 91°C rather than the standard 94°C because both the medium-light roast level and anaerobic processing call for gentler heat to protect the volatile aromatics that define this bean's distinctive character. Catuai's medium density at 975 meters extracts steadily through Chemex's slower drawdown, giving the darker chocolate base time to develop without muddying the bright fermentation top notes.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. The anaerobic fermentation-derived acids in Das Almas extract first — if you're stuck in that phase, you're tasting the volatile esters as sourness rather than as Concord grape character. More surface area pushes extraction through the CGA zone into the caramel zone.
thin: Increase dose by 1g or reduce water by 15g. Catuai at 975m has lower soluble density than high-altitude lots — the TDS ceiling is inherently lower. If the cup feels watery, the ratio is the primary lever. A metal filter alternative would add body but will change the fruit clarity significantly for this anaerobic lot.
Hario V60-02 89/100
Grind: 490μm Temp: 91°C Ratio: 1:15.3-1:16.3 Time: 2:30-3:30

At 91°C and 490μm, the V60 recipe for Das Almas is calibrated around one central challenge: anaerobic processing on a low-elevation Brazilian Catuai produces fermentation aromatics that are unusually fragile. The temperature is 3°C below default — 1°C for the medium-light roast and 2.5°C for the anaerobic processing — specifically to avoid driving off the maple syrup and Concord grape character before they've dissolved into the brew water. The grind lands 10μm finer than the V60 default: the anaerobic processing adds a +10μm coarsening that partly offsets the -20μm medium-light roast adjustment, landing at 490μm. The V60's paper filter strips the fermentation-derived oils that would otherwise muddy the fruit clarity. Catuai's transitional roasting character — more variable than Bourbon or Ethiopian group — makes this temperature control especially important.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. Das Almas's anaerobic volatiles are concentrated in the fast-extraction phase, so if you're tasting sharpness rather than grape and maple, extraction hasn't progressed past the acid zone. Finer grind increases surface area to push into caramel extraction.
thin: Increase dose by 1g or reduce water by 15g. The 975m Catuai has modest soluble density — less than a high-grown Colombian at 1,900m would carry. If the cup is watery, pull the ratio tighter. A metal filter would boost body but trades away the oil-stripping that makes the fruit notes legible.
Kalita Wave 185 88/100
Grind: 520μm Temp: 91°C Ratio: 1:16.3-1:17.3 Time: 3:00-4:00

The Kalita Wave's flat-bottom design produces measurably more uniform extraction than conical drippers by eliminating the center-focused flow path. For Das Almas, this matters because the anaerobic Catuai carries fermentation-derived compounds at different solubility thresholds than the base bean's chocolate and caramel structure — even extraction across the bed means you reach the sweetness window without some particles over-extracting while others are still in the acid zone. The recipe runs at 91°C (same -3°C delta as V60 and Chemex) and 520μm, 10μm finer than the Wave default. The slightly coarser grind relative to the V60 reflects the Wave's more forgiving flat-bed dynamics. Paper filtration strips the fermentation oils, focusing the cup on the Concord grape and maple syrup character that anaerobic processing generated in the sealed oxygen-free tanks before drying.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. Sourness in Das Almas on the Wave typically means extraction stalled in the volatile acid zone before reaching the caramelization products. The flat bed helps evenness, but total extraction depth still depends on surface area — grind is the fastest adjustment.
thin: Increase dose by 1g or reduce water by 15g. Das Almas at 975m extracts with less soluble density than altitude-premium lots. If the flat-bed's evenness is producing a clean but weak cup, the TDS is simply too low — tighten the ratio before adjusting grind.
AeroPress 84/100
Grind: 390μm Temp: 82°C Ratio: 1:12.3-1:13.3 Time: 1:00-2:00

AeroPress runs notably cooler than pour-overs for Das Almas — 82°C versus the 91°C on the Chemex and V60. The AeroPress baseline brews at 85°C (lower than most methods), and Das Almas picks up an additional temperature reduction from the anaerobic processing and medium-light roast level. At 82°C, chlorogenic acid extraction is substantially slowed, which means the window between extracting the fermentation-derived fruit character and over-extracting into bitterness is wider. The paper filter with AeroPress does the same oil-stripping work as the pour-overs, keeping the Concord grape and maple clarity intact. At 390μm (10μm finer than AeroPress default), the shorter brew time — 1 to 2 minutes — is compensated by finer particle exposure, and the 1:12.3–13.3 ratio keeps TDS in range despite the lower temperature.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. At 82°C, Das Almas extracts slowly — if sourness dominates, the fermentation esters are reading as acidity rather than as fruit character. Finer grind at this temperature gives more surface contact time in the short AeroPress brew window.
bitter: Grind coarser by ~22μm and drop temp by 1°C. If the Concord grape has disappeared and the finish tastes harsh, the AeroPress pressure has pushed extraction past the sweet zone into dry distillates. Coarser grind reduces contact surface and slows extraction to stay in the caramel window.
Clever Dripper 84/100
Grind: 520μm Temp: 91°C Ratio: 1:15.3-1:16.3 Time: 3:00-4:00

The Clever Dripper uses immersion rather than continuous pour, which changes how the Das Almas anaerobic compounds interact with the brew water. Instead of fresh water continuously sweeping through the grounds, the bed sits in the same water for the full 3 to 4 minutes. This means the concentration gradient between the coffee particles and the water decreases over time — extraction naturally decelerates as the water saturates, which reduces the risk of over-extracting the delicate fermentation aromatics in the final minutes. The recipe matches the Wave's 520μm grind and 91°C temperature — same modifiers, same paper filter logic. The paper captures the oils from the anaerobic processing, keeping the maple syrup and Concord grape character clear. At 1:15.3–16.3, the ratio is slightly richer than the V60, compensating for the immersion method's tendency toward slightly lower extraction yields with coarser grinds.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. In the Clever's immersion environment, concentration equilibrium is reached faster than in flow-through brewing — if the cup is sour, the equilibrium point landed short of the caramel extraction zone. Finer grind raises the maximum achievable extraction ceiling.
bitter: Grind coarser by ~22μm and drop temp by 1°C. Immersion at 520μm for 3–4 minutes can tip into over-extraction if the grind is too fine, since all particles stay in contact for the full steep time. Coarser grind limits total surface area to stay in the sweet zone.
Espresso 72/100
Grind: 240μm Temp: 90°C Ratio: 1:1.3-1:2.3 Time: 0:25-0:30

Espresso at 72/100 for Das Almas reflects a genuine tension: 9 bars of pressure and espresso-range TDS of 8–12% will concentrate all the anaerobic fermentation compounds, including the delicate aromatics responsible for the maple syrup and Concord grape notes — but also every acidic compound the anaerobic processing and medium-light roast left intact. Temperature is pulled to 90°C (same -3°C delta) and the grind lands at 240μm, 10μm finer than espresso default. The lower effective temperature is critical here because the pressure alone already drives aggressive extraction — combined with high heat, the fragile fermentation aromatics would be driven off or masked by over-extracted bitterness. The 1:1.3–2.3 ratio is tighter than pour-over, which concentrates the dark chocolate base; the anaerobic fruit should read as brightness on top of that foundation.

Troubleshooting
sour: Grind finer by ~10μm and raise temp by 1°C. Das Almas at light-medium with anaerobic modifiers has significant residual CGAs — under 9 bars this reads as sharp, vinegary sourness. Smaller grind increments matter for espresso; 10μm moves the extraction meaningfully in a compact puck.
bitter: Grind coarser by ~10μm and drop temp by 1°C. When the Concord grape disappears and the finish is ashy, pressure has pushed past the fermentation esters into dry distillate territory. Coarser grind reduces puck resistance and shortens contact time under pressure.
strong: Decrease dose by 1g or pull a longer shot to increase output water by 15g. Anaerobic Brazilian concentrated under espresso pressure produces intensely sweet TDS — if it's too thick to drink, pull the ratio longer before adjusting grind.
Moka Pot 63/100
Grind: 340μm Temp: 97°C Ratio: 1:9.3-1:10.3 Time: 4:00-5:00

The Moka Pot's 63/100 score for Das Almas reflects the fundamental mismatch between its ~1.5 bar steam pressure and this bean's fermentation-derived character. Unlike espresso's 9 bars, the moka pot extracts under lower but still elevated pressure, starting from pre-boiled water. The effective brewing temperature, even with the processing and roast-level adjustments, remains near boiling — which means the volatile fermentation-derived fruit aromatics responsible for the Concord grape and maple syrup notes are likely to vaporize off before they can concentrate into the brew. The recipe runs at 340μm (10μm finer than moka default) to compensate for extraction efficiency at lower pressure, and the 1:9.3–10.3 ratio produces a concentrated cup that emphasizes the dark chocolate foundation — which is the most durable flavor component at moka temperatures.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. Moka pot's lower pressure can stall extraction in the acid zone when the grind is too coarse — the Catuai's lower density at 975m compounds this. Finer grind at medium-fine range increases contact surface without requiring tamping.
strong: Decrease dose by 1g or increase water by 15g. The moka pot's 1:9.3–10.3 ratio is inherently concentrated — if the anaerobic dark chocolate and grape character is too intense, the ratio needs loosening before any grind changes.
bitter: Grind coarser by ~22μm and drop temp by 1°C. Moka pot's high temperature is the primary over-extraction risk for Das Almas — if the maple syrup sweetness has gone harsh, the fermentation volatiles boiled off and dry distillates took over. Lower heat and coarser grind together reduce extraction speed.
French Press 60/100
Grind: 990μm Temp: 93°C Ratio: 1:14.3-1:15.3 Time: 4:00-8:00

French Press scores 60/100 for Das Almas for a direct reason: its metal mesh filter lets the oils from anaerobic processing pass into the cup, and those oils directly compete with the fermentation-derived fruit character for your palate's attention. The Concord grape and maple syrup notes in Das Almas are water-soluble aromatic compounds — they extract regardless of filter type. But the natural and anaerobic processing also produces heavier oil compounds that, in an unfiltered method, create a heavy coating on the palate that can bury the delicate fermentation aromatics underneath. The recipe compensates with a slightly coarser 990μm grind (10μm finer than default) and 93°C temperature to pull adequate body. The 1:14.3–15.3 ratio at coarse grind produces a full-bodied cup where the dark chocolate dominates and the fruit plays a supporting role.

Troubleshooting
strong: Decrease dose by 1g or increase water by 15g. French press retains more TDS than paper filter methods because fines pass through the mesh — Das Almas's anaerobic processing produces more fine-extractable compounds than standard Brazilian naturals. Loosen the ratio before adjusting grind.
sour: Grind finer by ~22μm and raise temp by 1°C. Coarse immersion can stall extraction before the caramel compounds dissolve, especially in the Catuai's lower-density structure at 975m. Moving the grind finer pushes extraction deeper into the sweet zone.
Cold Brew Flash Brew Recommended

Cold brew is not recommended for this bean. At near-freezing temperatures, cold water cannot extract the complex acids, delicate aromatics, and bright fruit compounds that define a light-roasted coffee — they remain locked in the cell matrix. For a cold version of this coffee, use flash brew: brew a concentrated pour-over (V60 or Chemex at 60% of the normal water volume) directly over ice in the server. The hot water extracts the full flavor spectrum, and the rapid ice cooling locks in volatiles that would otherwise evaporate during a slow cool-down.