Onyx Coffee Lab

Burundi Long Miles Munyinya Hill

burundi medium-light roast washed red_bourbon
figcane sugarblackberrycaramel

"Dry washed" is a processing detail that sits between fully washed and honey process. The cherry skin is removed — fermentation happens in tanks as with standard washed — but the drying phase uses less water, leaving more mucilage on the parchment than traditional washed lots. The practical result: slightly more body and a thicker mouthfeel than a clean washed coffee, without the full fruit-compound transfer of a natural. That explains why fig and blackberry appear alongside cane sugar and caramel in this cup. The fig note is characteristic of mucilage-influenced drying — fig's flavor chemistry involves furanone derivatives and ester compounds that partially echo those from fruit contact. Blackberry is malic acid-dominant: malic is the crisp, berry-forward acid that sits below citric in terms of sensory threshold but contributes meaningfully to the red-fruit register. Cane sugar and caramel are roast-stage products. At medium-light, the Maillard reaction has produced brown sugar and caramel-range compounds — the less-caramelized browning products that dissolve earlier in extraction. Sucrose is nearly 100% consumed by this roast level; all perceived sweetness is aroma-mediated, driven by caramelization products and furanones that the olfactory system reads as sweet. Red Bourbon at 1,800 meters is doing the altitude work expected of Kayanza province. Burundi consistently extracts higher than Central American origins at comparable elevations — about 25.6% of variation in extraction yield traces to altitude. Raised-bed drying after the washed process improves drying uniformity, which tends to reduce the defect-adjacent murkiness that can appear in Burundian washed lots when drying is inconsistent. The medium-light roast on Red Bourbon preserves the malic/citric brightness while pushing Maillard far enough to build the caramel backbone.
Hario V60-02 88/100
Grind: 480μm Temp: 93°C Ratio: 1:15.3-1:16.3 Time: 2:30-3:30

The V60 recipe for this Burundi applies three simultaneous deltas: -1°C temperature, -20μm grind, and +0.5 ratio shift — all from the medium-light roast, working together. At 1,800m in Kayanza province, this Red Bourbon has the altitude density expected of East African specialty coffee. The 480μm grind is tighter than a standard medium would need because the medium-light terminal temperature preserved more bean structure than a medium roast, reducing extraction accessibility. At 93°C the V60's cone geometry produces fast drawdown that keeps contact time in the sweet spot for the blackberry and fig character — both develop in the middle of the extraction that benefit from the balance between surface area and water temperature this recipe achieves.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. This 1,800m Red Bourbon has significant density — sourness means the grind is still too coarse for the roast correction. The fig and blackberry notes appear mid-extraction; sour means they haven't dissolved yet.
thin: Add 1g dose or pull 15g less water; try a metal filter for oil-based body. At medium-light roast, the paper filter removes oils that would contribute mouthfeel. Metal filter adds body; more dose raises TDS.
Kalita Wave 185 88/100
Grind: 510μm Temp: 93°C Ratio: 1:16.3-1:17.3 Time: 3:00-4:00

Kalita Wave ties the V60 at 88 for this Burundi, with a coarser 510μm grind to account for the flat-bottom's slower drainage. The three-hole drain geometry ensures even water distribution across the full bed, which improves extraction uniformity. The Kalita's flat-bed equalization reduces channeling that can produce cups where sweetness spikes in some pours and disappears in others. At 1:16.8 ratio and 93°C, the brew hits the extraction zone where cane sugar and caramel compounds — medium-light roast Maillard products — dissolve ahead of the heavier melanoidins. The five-pulse pour technique agitates the bed enough to continuously refresh the concentration gradient and keep the extraction rate high.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. The Kalita's flat bed reduces channeling but medium-light roast Burundi still needs adequate surface area for full extraction. Sourness means the blackberry malic acid is extracting without the caramel compounds catching up.
thin: Add 1g dose or pull 15g less water; try a metal filter. The Kalita paper filter strips oils — body in this cup is primarily from melanoidins, which are reduced by the leaner ratio. Increasing dose is the most reliable fix.
Chemex 6-Cup 86/100
Grind: 530μm Temp: 93°C Ratio: 1:15.3-1:16.3 Time: 3:30-4:30

Chemex scores 86 for this Burundi — two points below the V60 and Kalita — because the thicker bonded filter's oil-stripping effect reduces body. Washed processing produces clean, bright coffees that let terroir and varietal characteristics shine through, and the Chemex amplifies that clarity effect. What it preserves is the clean acid structure: fig aromatics pass through paper (they're soluble, not oil-bound), as does the malic acid driving blackberry. At 530μm and 93°C, the recipe is calibrated for the Chemex's slower drawdown. The cane sugar and caramel notes come through with exceptional clarity — a lighter, tea-like rendition of the Burundi profile, missing some of the body that the 1,800m altitude Red Bourbon is capable of producing.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. The Chemex's slow drawdown can let extraction stall at the acid phase, especially at medium-light roast where solubility is still below medium. The fig and caramel notes require the middle extraction phase to fully express — sourness means they're not there yet.
thin: Add 1g dose or pull 15g less water; try a metal pour-over for body. The Chemex's thick paper removes oils plus melanoidins from medium-light roast. Dose is the primary lever since the filter choice is structural.
AeroPress 85/100
Grind: 380μm Temp: 84°C Ratio: 1:12.3-1:13.3 Time: 1:00-2:00

AeroPress scores 85 for this Burundi at 84°C — a lower brew temperature reflecting the medium-light roast's adjustment applied to AeroPress's already lower baseline. The pressure extraction compensates for lower temperature in a way that gravity cannot: at low pressure, water penetrates bean structure more effectively, extracting the compounds that give fig its characteristic flavor even at temperatures that would underextract them in a V60. The fine 380μm grind (adjusted finer for medium-light roast) maximizes surface area within the short 1-2 minute brew window. At 1:12.8 ratio, the concentrate volume is richer than pour-over, which brings the cane sugar sweetness into focus — the medium-light roast's caramelization products are at their peak here, and AeroPress concentration makes them register more clearly than at pour-over TDS levels.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. At 84°C the extraction rate for this medium-light Burundi is already conservative — if the plunge is fast or grind is slightly coarse, acids clear before the caramel compounds dissolve. Extend total contact time slightly before adjusting temp.
thin: Add 1g dose or pull 15g less water; switch to metal filter for oil body. The AeroPress paper removes oils despite the short contact time. Metal filter restores body that paper filtration removes.
Clever Dripper 85/100
Grind: 510μm Temp: 93°C Ratio: 1:15.3-1:16.3 Time: 3:00-4:00

Clever Dripper ties AeroPress at 85 for this Burundi, operating at 93°C with a 510μm grind and sealed immersion before paper-filtered release. The sealed valve immersion phase is the key advantage for a medium-light roast: it allows full contact time for the fig and caramel compounds to dissolve without relying on gravity flow rate to keep extraction moving. Pour-over methods at medium-light roast depend on drawdown speed — fast flow can prematurely end extraction before caramelization products fully dissolve. The Clever eliminates that variable. At 1:15.8 ratio and 3-4 minute total brew time, the recipe extracts the cane sugar and blackberry character completely before the valve releases and paper filtration strips oils. The result is a cleaner-than-French-Press cup with more body than Chemex — body holds up even after oil removal.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. The Clever's immersion should provide enough contact time for this Burundi — if sour persists, extend the dwell 30 seconds before draining. Medium-light roast has more dissolved mass than light, so sourness is typically a grind or timing issue.
thin: Add 1g dose or pull 15g less water; try a metal insert. The paper filter removes oils even after immersion has extracted them. Metal insert preserves more mouthfeel.
Espresso 83/100
Grind: 230μm Temp: 92°C Ratio: 1:1.3-1:2.3 Time: 0:25-0:30

Espresso scores 83 for this Burundian medium-light, with recipe adjustments applied to the default: slightly lower temperature, finer grind, and a longer ratio. The ratio lands at 1:1.8 output (19g in, 33g out) — shorter than the typical 1:2, which concentrates the caramel and fig into a smaller volume where they read at espresso intensity. The finer grind for medium-light roast is significant under 9-bar pressure: even small grind reductions create large flow-restriction increases at espresso puck densities. At 92°C, the extraction captures blackberry character and cane sugar caramelization products in the concentrated form where they're most evident — the 1,800m altitude means high-density cells that extract predictably under pressure. The shot should present as fruit-forward with a sweet caramel base.

Troubleshooting
sour: Grind finer by ~10μm and raise temp 1°C. Medium-light Burundi under pressure extracts the malic blackberry character fast — if the shot runs in under 25 seconds, acids dominate before caramel and fig compounds extract. Check that grind is dialed tight enough for 25-30 second extraction at this ratio.
thin: Add 1g dose. At 1:1.8 output ratio the shot is already short — thin espresso from this Burundi usually means insufficient dose rather than a ratio problem. The 1,800m altitude ensures good extraction efficiency when dose and grind are dialed correctly.
Moka Pot 81/100
Grind: 330μm Temp: 99°C Ratio: 1:9.3-1:10.3 Time: 4:00-5:00

Moka Pot scores 81 for this Burundi at 99°C — a high brewing temperature reflecting the standard moka pot approach of pre-boiled water. Pre-boiled water in the lower chamber means the steam pressure builds quickly, which limits how long the grounds are in contact with wet, hot vapor before actual extraction begins. For a medium-light roast at 1,800m, this matters: the dense, high-altitude Red Bourbon needs more thermal energy to open cell walls than lower-altitude or darker-roasted beans, and the rapid pressure build from pre-boiled water ensures sufficient extraction temperature when the water actually passes through the basket. At 330μm grind (-20μm roast correction) and 1:9.8 ratio, the concentrate is richer than pour-over but lighter than espresso. The fig and caramel notes read at Moka-intensity: richer than filter, less articulate than espresso.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. Moka Pot sourness from this 1,800m medium-light suggests the grind is too coarse for 1.5-bar extraction — high-altitude dense Red Bourbon resists extraction at low pressure unless surface area is maximized. Pre-boiled water technique also matters: cold-start Moka under-heats early extraction.
strong: Decrease dose by 1g or increase water by 15g. The 1:9.8 concentrate ratio is intentional for Moka, but at 1,800m altitude the dense bean extracts efficiently — the caramel and blackberry can stack to overwhelming intensity. Lean the ratio slightly rather than adjusting grind.
French Press 79/100
Grind: 980μm Temp: 95°C Ratio: 1:14.3-1:15.3 Time: 4:00-8:00

French Press scores 79 for this medium-light Burundi, and the mechanism tells the story. French Press, which passes all oils and fine particles without paper filtration, produces a cup where the fig and blackberry read in a heavier, more textured register than any paper-filter method. At 95°C (2°C above pour-over temp for heat compensation) and 980μm extra-coarse grind, the recipe steeps for 4-8 minutes. The extended time matters: the Maillard compounds that the 1,800m altitude and medium-light roast have developed extract fully during the long steep. The 79 score reflects the presence of sediment and fines that slightly cloud the fig clarity, not a fundamental extraction mismatch.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. French Press with this medium-light Burundi rarely sours if steep time is adequate — sourness usually means insufficient steep or premature plunging. Run the full 4-minute steep before pressing; this 1,800m Red Bourbon has the density to benefit from the full time.
thin: Add 1g dose or pull 15g less water. Unlike paper-filter methods, French Press thin means insufficient dissolved solids — the oils are already in the cup. More coffee is the fix; at 1:14.8 ratio the recipe is already slightly richer than default for the medium-light correction.
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.