Most Ethiopian coffee is roasted light. George Howell's medium roast of the Worka Chelbessa lot from the same washing station is a deliberate departure — and it produces a chemically different cup than the light version from the same source.
Medium roasting extends development past where light roasts stop, continuing organic acid degradation beyond the citric-malic sweet spot and into deeper Maillard territory. Citric and malic acids — the bright, pleasant acids that dominate light Ethiopian washed lots — partially decompose. The stewed peach note reflects exactly this: malic acid (clean, crisp apple and stone fruit at lighter development) reading as softer and more cooked when roast degree pushes further. The "stewed" quality isn't a defect; it's what happens when malic acid concentration drops and the heavier caramelization compounds dominate the acid profile.
At 2,051 meters, this bean carries more organic acid and soluble content than lower-altitude Ethiopian lots — meaning there's enough acid to survive partial degradation and still contribute to the cup. A medium roast on a low-altitude bean from the same processing would land flat; at Gedeb's elevation, there's margin to develop further without losing structure entirely.
The honeyed finish comes from Maillard reaction products accumulating through extended roasting. Strecker degradation of amino acids produces methylpropanal and related aldehydes — these read as honey-like, caramelly, and malty rather than the jasmine and bergamot of the lighter roast. Melanoidin content also increases with roasting time, building body. The result is a cup that sits in the chocolate-caramel register rather than the floral-citrus one.
Extraction behaves differently at medium roast. Darker roasting reduces the bean's available solubles — a medium Ethiopian at 2,051m extracts differently than a light one from the same lot. The higher soluble ceiling means the medium version still extracts well.
AeroPress earns the top score at 88/100 for the medium roast, and the gap from pour-over methods is narrower here than on many other beans because medium roast and AeroPress extraction mechanics align well. At medium roast, Worka Chelbessa has shed most of the fragile citrus volatile aromatics that require careful temperature management — the stewed peach and honeyed character is driven by Strecker aldehyde products (methylpropanal at malty-honey, floral aromatics at floral) that are more thermally stable. The recipe uses 83°C (–2°C for medium roast, down from 85°C baseline) and 380μm grind (–20μm from default, reflecting the altitude-based density adjustment). The short steep time of 1–2 minutes with AeroPress pressure produces a concentrated cup that magnifies the caramel-honey register without needing to manage flow-rate as carefully as pour-over.
Troubleshooting
sour: Grind finer by ~22μm and raise temperature by 1°C. AeroPress at 83°C with medium roast is already a conservative temperature approach — if the cup still tastes sharp, grind is the variable. A finer grind increases puck resistance, slows flow, and extends extraction time past the acid phase. Stir before pressing to ensure even saturation.
thin: Increase dose by 1g or reduce water by 15g. AeroPress with standard paper filter removes oils; body comes from soluble solids. The 1:12.5–1:13.5 ratio is already fairly concentrated — if thin, check that you're measuring by weight, not volume. A metal AeroPress filter adds structural body if ratio adjustment doesn't fully resolve it.
The Clever Dripper scores 88/100 — tied with AeroPress for the top spot — because the medium-roasted Worka Chelbessa benefits specifically from the Clever's immersion-then-filter design. Immersion ensures even saturation across all grind particles before drainage begins, which matters for a bean that still has significant organic acid structure at medium roast. The caramelized honey and stewed peach compounds from Maillard development need time to dissolve fully — the Clever's 3–4 minute steep at 92°C gives them that time before the paper filter passes only clean soluble solids. The recipe uses 510μm (with the –20μm altitude-based density adjustment from the 530μm default) and 1:15.5–1:16.5 ratio. The valve-release timing is the key variable: release only when the steep is complete, not when you pour — premature release creates a continuous-pour dynamic that bypasses the immersion advantage.
Troubleshooting
sour: Grind finer by ~22μm and raise temperature by 1°C. If releasing the valve at 3 minutes and still getting sourness, the steep is either too short or the grind too coarse to extract into sweetness territory. Extend steep to 4 minutes first, then grind finer if needed. At 2,051m, this bean has enough soluble depth to extract further without bitterness risk.
thin: Increase dose by 1g or reduce water by 15g. The Clever's paper filter removes oils — body comes from melanoidin solids that the medium roast builds more of than the light version. Tighter ratio is the fix. Also ensure full water coverage during steep; partial saturation from insufficient water volume produces thin extraction.
The V60 scores 87/100 for this medium roast, a slight step down from the light version's 88/100, for a meaningful reason: at medium roast, the Worka Chelbessa has shifted from the citrus-floral register into stewed peach and caramel territory. The V60's clarity-first extraction mode remains useful, but the compounds worth preserving here — roast-developed body compounds and aldehydes from Strecker degradation (methylpropanal, floral aromatics) — are somewhat less fragile than the light roast's volatile citrus aromatics. The recipe drops temperature to 92°C (–2°C for medium roast reducing solubility slightly) and uses a 480μm grind (–20μm vs. default, reflecting altitude-based density with a slight offset for the heirloom variety's fines characteristics). The result is a V60 that delivers the honeyed, stone-fruit character the medium roast generates without overextracting into bitter territory.
Troubleshooting
sour: Grind finer by ~22μm and raise temperature by 1°C. Medium roast reduces but doesn't eliminate citric acid — this 2,051m bean retains organic acid structure even after development. If the cup reads sharp rather than clean-fruity, extraction is still in the acid phase. Finer grind pushes into the sweetness zone.
thin: Increase dose by 1g or reduce water by 15g. The V60 paper strips oils, and the medium roast's melanoidins are now doing more body work than oils anyway. Tighten the ratio first; if body remains low, a metal filter helps, but it will dull some of the caramel clarity this roast level produces.
The Kalita Wave scores 87/100 for this medium roast, tied with the V60, and the medium-roast profile suits the Kalita's operating character well. The flat-bottom three-hole design produces a more even contact time than a cone dripper — every section of the coffee bed drains at roughly the same rate — and for a medium-roasted Ethiopian heirloom whose flavor compounds are distributed more evenly through roast development (rather than concentrated in fragile volatile top notes), that extraction evenness translates directly to cup balance. The recipe targets 510μm, 30μm coarser than the V60's 480μm, accounting for the Kalita's longer contact time from restricted drain. Temperature at 92°C and ratio at 1:16.5–1:17.5 reflect medium roast's slightly improved solubility without chasing the light version's extraction-first approach.
Troubleshooting
sour: Grind finer by ~22μm and raise temperature by 1°C. The Kalita's flat bed can stall if fines from this Ethiopian heirloom collect unevenly — check that the bed is level after bloom before main pours. If flow is uniform but cup is still sour, the grind is the variable. Finer grind moves extraction past the acid phase.
thin: Increase dose by 1g or reduce water by 15g. Kalita Wave paper is thinner than Chemex but still removes oils. At medium roast, melanoidin body is the main mouthfeel contributor — tightening the ratio increases the soluble solids in the cup. Avoid pouring on the paper walls, which collapses them and channels flow unevenly.
The Chemex scores 85/100 for the medium roast, and the reason reveals something about how roast level and filter type interact. At medium roast, more of the bean's character resides in Maillard products — melanoidins and caramelization compounds — that carry honey and stewed peach notes through soluble rather than oil-bound pathways. The Chemex's thick paper still does its job of removing oils, but the tradeoff matters less here than it would for a light roast where volatile citrus-floral aromatics dominate. Temperature drops to 92°C and grind opens to 530μm, reflecting medium roast's slightly better solubility. The result is still clean and defined, though lighter-bodied than what other methods extract from this bean.
Troubleshooting
thin: Increase dose by 1g or reduce water by 15g. The Chemex's oil removal is less of a deficit at medium roast — body here comes from melanoidin solids — but ratio still determines TDS. Close the ratio before switching filters. The thick Chemex paper is the body floor; tighter ratio is the ceiling adjustment.
sour: Grind finer by ~22μm and raise temperature by 1°C. Even at medium roast, this 2,051m Gedeb bean has significant organic acid structure. The Chemex's slow drawdown can still underextract if grind is too coarse — extraction stops in the acid phase before caramelization sweetness dissolves. Finer grind pushes extraction further.
Espresso scores 85/100 for the medium roast — a strong match, which is expected. Medium roast increases solubility and reduces the density of underextracted acidity that makes light-roast espresso difficult to dial in. The recipe reflects this: grind sits at 230μm, temperature drops to 91°C (–2°C for medium roast applied to the 93°C default), and the ratio targets 1:1.5–2.5. Medium roast at this development level doesn't require extended-ratio or preinfusion-heavy protocols, so the recipe treats this as a standard espresso extraction. The stewed peach and honey character concentrates under 9-bar pressure in a way that reads as rich and defined — a rounded, sweet profile with body.
Troubleshooting
sour: Grind finer by ~10μm and raise temperature by 1°C. Medium roast at espresso parameters still has residual organic acid structure from this 2,051m bean. If the shot tastes sharp or green-fruity, the extraction yield is below 18% — finer grind slows the shot and increases yield. Target 25–28 second extraction at the recipe ratio.
bitter: Grind coarser by ~10μm and drop temperature by 1°C. Medium roast espresso is more susceptible to overextraction than light — the CGA lactonization products formed at medium roast extract readily under pressure. If the shot tastes harsh or astringent, reduce extraction rate with coarser grind before adjusting dose.
Moka Pot scores 83/100 for the medium roast, because medium roast's reduced volatility makes it less vulnerable to the moka pot's primary flaw with delicate beans: overheating during the final steam phase. Volatile citrus and floral aromatics can cook off during moka pot's slow thermosiphon; at medium roast, the stewed peach and honey notes are caramelization products with higher thermal stability. The recipe adjusts for medium roast accordingly: 330μm grind and 98°C with pre-boiled water. The altitude-based grind adjustment produces a –20μm shift from default, resulting in a moderate medium-fine setting. Pre-boiled water in the base chamber is critical — it prevents the slow heating that cooks grounds in steam before hot water arrives, which particularly affects Ethiopian heirlooms whose slightly elevated fines can clog the basket unevenly.
Troubleshooting
sour: Grind finer by ~22μm and verify pre-boiled water in the base. Medium-roast moka pot sourness usually traces to slow, uneven extraction — grounds cook in steam before water pressure builds, extracting only acids. Pre-boiling water eliminates this. If sourness persists, finer grind increases extraction rate through the basket at correct temperature.
strong: Decrease dose by 1g or increase water by 15g. The 1:9.5–1:10.5 ratio produces a concentrate — if drinking straight rather than diluting, the medium-roast caramel-honey character reads as intense. Open the ratio slightly before diluting with hot water to calibrate strength to preference.
French Press scores 82/100 for the medium roast, and the match is chemically meaningful. Medium roast produces more melanoidins through extended Maillard reaction: these high-molecular-weight browning polymers contribute body and mouthfeel through soluble channels and don't depend on the oil fraction to reach the cup. The French press's metal mesh passes both oils and fines, which can be problematic for Ethiopian heirlooms (elevated fines keep extracting bitterness in the cup), but at medium roast, the bitterness ceiling from fines is lower because the bean's CGA content has degraded further during development. The recipe targets 980μm and 94°C (temperature drops 2°C from the default for medium roast). The coarser grind reduces fine generation somewhat while still extracting adequately from the 2,051m bean.
Troubleshooting
sour: Grind finer by ~22μm and raise temperature by 1°C. French press of a medium Ethiopian is less sour-prone than the light version, but the coarse grind means main particles may still be underextracted. If you're using Hoffmann's method — waiting 5–8 minutes after pressing — the extra settling time helps fines sink and reduces their continued extraction contribution.
strong: Decrease dose by 1g or increase water by 15g. French press passes oils and fines, both of which add to perceived strength and body. The 1:14.5–1:15.5 ratio is already slightly tighter than pour-over defaults — if the cup is heavy or intense, open the ratio before adjusting grind. Letting grounds settle after pressing also reduces extraction.
Cold Brew scores 78/100 for the medium roast — a solid match that reflects how medium roast's increased solubility makes it more compatible with cold water's gentler extraction power. Cold brew extracts fewer acids than hot methods, which means the stewed peach and honey character of this medium roast reads differently cold — less tart stone fruit, more caramel smoothness. The sweet, rounded flavors come through cleanly while the harsher bitter compounds that medium roast begins to develop stay largely unextracted at cold temperatures. The recipe targets 2°C and 880μm with a 1:6.5-1:7.5 ratio — the grind is 20μm finer than default to account for the bean's high-altitude density.
Troubleshooting
flat: Grind finer by ~22μm and raise temperature to 4°C; check bean freshness and water mineral content. Flat cold brew from this bean usually means the Maillard caramel compounds that give the stewed peach character aren't extracting — either beans are stale (volatile compounds oxidized) or water mineral content is too low. Aim for 75–150 ppm total dissolved solids in brew water.
thin: Increase dose by 1g or reduce water by 15g. Cold brew of a medium Ethiopian at 1:6.5 is already fairly concentrated — if thin after ratio check, verify steep time is reaching at least 12 hours. Research shows most extraction of caramelization compounds completes between 7–14 hours; beyond 14 hours adds bitterness without adding body.