Karenzo, Peaberry

The V60's recipe for this peaberry pulls grind to 415μm — 85μm finer than default — a large adjustment driven by three factors working together. Light roast contributes the biggest share because light-roasted beans are harder, more compact, and less porous than medium or dark; they need finer grinding to achieve equivalent surface area for extraction. The high altitude at Karenzo adds further fineness because denser, slow-matured beans require more surface area to match extraction rates. Natural processing adds back a modest coarsening to prevent the processing-derived fruit compounds from over-extracting in an already-fine grind. The V60's open ribbing handles this fine setting without stalling, and the peaberry shape helps: round, dense peaberries grind more uniformly than flat-sided beans, meaning fewer unpredictable fines in the conical bed.

The Kalita Wave's flat bottom and restricted three-hole drain create a slight immersion layer during pouring — and for this light-roasted natural peaberry, that brief additional contact time matters. Light roasting leaves acidity largely intact, making extraction harder to push through to the sweet caramelised peach zone. The flat-bed's brief pooling gives water an extra moment with each pour to keep extraction climbing above the acid-only threshold. The recipe uses a slightly more dilute ratio (+0.5 from default) than standard because light roast Red Bourbon at 2,200 meters carries intense bright acidity — the increased water volume buffers perceived sourness while the fine 445μm grind maintains extraction yield. Temperature ceiling at 92°C reflects the altitude processing rule: natural fermentation compounds need protection even at this dense, high-altitude lot.

This lot's AeroPress recipe runs at 92°C — warmer than typical AeroPress brewing, where lower temperatures are the norm. The altitude ceiling rule combined with processing offset drives this: natural processing pulls temp down 2°C to protect fragile fermentation volatiles, but the AeroPress base temperature climbs to accommodate this extremely high-grown, light-roasted peaberry that needs thermal energy to push extraction past the intact initial acidity. The 315μm fine grind and 1-2 minute immersion do the rest. Paper filter use is critical: the AeroPress metal filter would pass oils that compete with the cranberry citric clarity at this fine grind.

The Clever Dripper at 81/100 handles this lot's core brewing challenge — a light-roasted natural that's dense, high in the acidity that light roasting preserves, and fragile in its fermentation volatiles — through its immersion-then-filter mechanism. The full immersion phase at 92°C with 445μm grind builds extraction evenly across all particles before drawdown. For a peaberry lot where particle size uniformity is actually better than average (round seeds grind more consistently), the immersion phase benefits from that uniformity: fewer fines means the steep doesn't generate excessive bitterness before the valve opens. The paper filter at drawdown cleans the natural processing oils without losing the bright acidity brightness. This results in a more body-complete cup than the V60 — the immersion builds caramelised peach extraction that the V60's fast flow might skip past.

Espresso scores 73/100 on this Burundi peaberry because light-roasted naturals are technically demanding in espresso: low solubility from the dense light-roast structure requires fine grinding to 165μm, longer ratios (output to 45g vs standard 38g), and higher temperature than typical light-roast espresso guidance suggests. The recipe targets 92°C — the altitude ceiling — because density demands thermal energy for proper extraction. The extended ratio (1:2.4 average) dilutes the concentrated extraction with more water, which for a light roast with cranberry-level acidity produces a brighter, fruitier shot rather than a dense ristretto. Expect underextraction to be the primary failure mode: cranberry sourness will dominate if extraction is short, and there is no forgiving sweetness buffer as with a dark roast — every gram of puck resistance matters.

The 44/100 match score tells you something real about the interaction here. A light-roasted natural from 2,200 meters in Burundi brewed through a metal mesh in a Moka Pot produces a fundamental conflict: the high the acidity that light roasting preserves content from light roasting passes through unfiltered (no paper to trap them), and the steam pressure's forced extraction adds abrasive bitterness without the 9-bar precision control of espresso. The fermentation oils that the metal mesh passes add body, but that body doesn't complement cranberry bright acidity — it competes with it. Temperature is reduced 8°C from standard (to 92°C) because natural processing volatiles need protection, but Moka Pot temperature is difficult to control precisely — the base water temperature determines how the steam builds. If you're committed to this method, use pre-boiled water and remove immediately when sputtering begins.

French Press at 40/100 is the second-lowest recommendation for this lot, and the chemistry explains why. The metal mesh passes all the natural processing oils through at a coarse 915μm grind — and those oils, on a light-roasted Burundian natural, bring fermentation volatiles that are interesting in a paper-filtered context but become sour-jammy in unfiltered immersion. More critically, light roasting leaves the acidity that light roasting preserves at high concentrations, and French Press's long immersion extracts them aggressively. The result is often a cup with both sourness (acidity) and a muddied, heavy character (unfiltered oils) simultaneously — the two failure modes reinforcing each other. The recipe adjusts temp to 92°C for the same natural-processing protection rule, with a longer 4-8 minute steep range that can be shortened to 4 minutes if sourness is dominant.