Da Matteo

Kenya - AA Inoi Ndimi

kenya light roast washed sl28, sl34
mandarin zestcloudberrycacao nibs

Kirinyaga sits on the southern slopes of Mount Kenya, and at 1,725 meters the cherry maturation cycle slows enough to accumulate the acids and volatile precursors that make Kenyan SL28 and SL34 among the most celebrated varieties in specialty coffee. Altitude explains roughly 25% of variation in extraction yield — these beans carry a denser soluble load than coffees grown at lower elevations, which translates to a cup that rewards careful attention to grind evenness rather than just grind size. SL28 was bred by Scott Laboratories specifically for the Kenyan highlands. Its flavor character centers on blackcurrant and citrus — compounds rooted in citric acid concentration. Citric acid is the only organic acid in coffee that consistently exceeds its sensory detection threshold in the brewed cup, and SL28 carries it in abundance. Here it reads as mandarin zest: the citrus is clean and precise rather than diffuse. SL34 contributes a slightly rounder, softer layer underneath. The cloudberry note — tart, slightly floral, closer to raspberry than blackberry — points to volatile ester activity preserved at light roast. These esters are among the first compounds lost to heat during development; pulling early locks them in. The light roast also keeps chlorogenic acid levels high, which drives brightness. Push development further and those CGAs decompose into quinic acid, the bitter compound that accumulates in stale and over-roasted coffee alike. Cacao nibs land in the Maillard band — specifically the browning reactions that produce pyrazines and melanoidins, which at this roast level read as dark chocolate without bitterness rather than the roasted-bean character that appears further into development. The three notes here occupy three distinct chemical layers, which is part of what makes [Kenyan coffee](/blog/kenyan-coffee-flavor-notes-and-best-coffees) so structurally layered to brew with.
Chemex 6-Cup 96/100
Grind: 480μm Temp: 94°C Ratio: 1:15.0-1:16.0 Time: 3:30-4:30

The Chemex earns a 96/100 match here because its thick paper filter does something specific to SL28/SL34 acidity: it removes essentially all oils and colloidal solids, leaving the mandarin zest and cloudberry notes stripped clean of any textural interference. The grind lands at 480μm — 70μm finer than default — because light-roasted Kenyan SL28 at 1,725m is exceptionally dense, demanding significantly more surface area to pull those tightly-packed solubles into solution at 94°C. The 40μm light-roast adjustment provides the baseline extraction push, and the remaining 30μm reflects the additional challenge of extracting a dense, high-altitude Kenyan coffee through the Chemex's thick filter. The 1:15.5 ratio keeps TDS in range while the longer 3:30–4:30 drawdown window accommodates the thick filter's restricted flow without channeling. high acidity levels in the light roast benefit from the Chemex's extended contact time at this grind, converting enough of them to avoid sourness without over-extracting into bitter quinic territory.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. At 94°C, the SL28/SL34's density and light roast create an underextraction risk — only citric and malic acids are pulling through the thick Chemex filter. The adjustment increases surface area so Maillard sweetness catches up.
thin: Add 1g coffee or remove 15g water to tighten the ratio toward 1:15.0. At 1:15.5, SL28's low-yield variety character can leave the cup feeling dilute through the Chemex's heavy filtration. Metal filter as a test is an option but reduces the method's core clarity advantage.
Hario V60-02 88/100
Grind: 430μm Temp: 94°C Ratio: 1:15.0-1:16.0 Time: 2:30-3:30

The V60 scores 88/100 on this Kenyan light roast — strong, but behind the Chemex because its thinner paper filter lets more colloidal solids pass, softening the precision of the mandarin zest note. The grind at 430μm reflects the same -70μm offset as the Chemex but lands finer in absolute terms because the V60 drains faster. At 94°C and a 1:15.5 ratio, you're targeting the extraction window where SL28's acidity pushes into the bright citrus zone without tipping into vinegar. The continuous-pour technique matters here: SL28 and SL34 are dense, hard beans at light roast, so even pouring reduces the risk of localized over-extraction in fines clusters while the coarser fraction is still pulling. Bloom at 45 seconds to degas before extraction begins in earnest.

Troubleshooting
sour: Grind finer by ~22μm and bump temp to 95°C. The V60's faster drain rate amplifies underextraction risk with light-roast Kenyan. SL28's dense cellular structure at 1,725m altitude means you need additional surface area to push extraction past the acid-dominant early phase.
thin: Increase dose by 1g to 20g or reduce water by 15g. The V60's open drain can run fast with a light roast, pulling TDS below target. A metal filter is an option if you want body, though it sacrifices the clarity that makes SL28/SL34 so distinctive here.
Kalita Wave 185 88/100
Grind: 460μm Temp: 94°C Ratio: 1:16.0-1:17.0 Time: 3:00-4:00

The Kalita Wave matches the V60 at 88/100 by offering a different trade-off: the flat-bed design distributes water contact more evenly across the coffee bed, which is particularly useful for light-roast Kenyan coffees with intense acidity that benefits from thorough, uniform extraction. With the V60's conical geometry, uneven flow paths can lead to pockets of over- and under-extraction; the Kalita's three-hole flat bed promotes more consistent contact across the entire bed. The 460μm grind and 1:16.5 ratio push extraction evenness — slightly more dilute than the V60 recipe, which works with the Wave's longer contact characteristics. At 94°C, you're in the window that balances full extraction of the bright fruit and berry acids against the risk of pulling harsh bitterness. The pulse-pour technique keeps even saturation across the flat bed, helping the SL28/SL34 acidity resolve into clean, juicy brightness rather than sharpness.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. The Kalita's flat-bed design is forgiving but can't fix underextraction from the light roast's density alone. With SL28/SL34's intense acidity, even minor underextraction produces sharp sourness rather than clean citrus.
thin: Increase dose by 1g or decrease water by 15g. The 1:16.5 ratio on the Kalita sits at the dilute end for SL28/SL34's low solubility at light roast. Tighten to 1:16 first before adjusting grind — the flat bed should extract evenly at that concentration.
AeroPress 82/100
Grind: 330μm Temp: 85°C Ratio: 1:12.0-1:13.0 Time: 1:00-2:00

The AeroPress lands at 82/100 for this Kenyan — its main limitation is that the 85°C temperature dampens the delicate aromatics responsible for the cloudberry note, which are sensitive to thermal conditions during extraction. That said, 85°C is correct here: it prevents the intense SL28/SL34 citric acidity from over-extracting under pressure and turning sharp. At 330μm, the grind is significantly finer than filter methods to compensate for the short 1–2 minute contact time — the higher surface area accelerates extraction so that roast-developed sweetness and cacao nib roast-developed sweetness can catch up to the fast-extracting acids. The 1:12.5 ratio produces a more concentrated shot suitable for AeroPress's immersion-plus-pressure mechanism. The paper filter removes cafestol, keeping the cup clean despite immersion contact.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C toward 86°C. At 85°C, SL28/SL34's high CGA load can stall in the early-extraction phase, producing sharp citrus rather than the clean mandarin zest the bean is capable of. More surface area helps push through.
thin: Add 1g dose or reduce water by 15g. The AeroPress's 1:12.5 ratio is already concentrated, but if the bean's solubility is running low, TDS can still miss target. Avoid the metal filter — at this concentration, oils from SL28 can tip the cup toward heaviness.
Clever Dripper 82/100
Grind: 460μm Temp: 94°C Ratio: 1:15.0-1:16.0 Time: 3:00-4:00

The Clever Dripper matches the AeroPress at 82/100 — it combines paper filtration with immersion contact in a way that produces reasonably clean extraction of SL28/SL34's citrus-driven profile. The paper filter preserves the clarity advantage over French press, while the immersion phase before draining provides more contact time than a straight pour-over at comparable grind settings. At 460μm and 94°C, the recipe sits between the V60's flow-dependent extraction and the AeroPress's pressure-assisted mechanism. The 1:15.5 ratio matches the V60 and Chemex targets; the Clever's longer immersion means you're not dependent on pour technique to hit that contact time. For SL28/SL34 specifically, the immersion phase helps even out extraction across the high-density particle distribution typical of light-roast Kenyan.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. The Clever's immersion phase is more forgiving than pour-over, but SL28/SL34's citric acid intensity means even slight underextraction produces sharpness rather than clean brightness. Extending steep time by 30 seconds is also worth trying before adjusting grind.
thin: Increase dose by 1g or reduce water by 15g. The Clever's full immersion draws down at the end via valve release — if TDS comes up short, the ratio is the lever to pull. Kenyan SL28/SL34 at light roast has low solubility; don't rely on the immersion phase alone to boost strength.
Espresso 81/100
Grind: 180μm Temp: 93°C Ratio: 1:1.9-1:2.9 Time: 0:28-0:35

Espresso scores 81/100 for this Kenyan — viable, but demanding. The 180μm grind reflects the same -70μm offset used across all brewers for this bean, meaning this is already finer than default espresso to compensate for the light roast's lower solubility. At 93°C, you're pulling temperature down 1°C from the filter recommendation to give some buffer against the intense SL28/SL34 acidity becoming overwhelming under 9-bar pressure. The 1:2.4 ratio is longer than a traditional Italian ristretto — this is intentional for light roasts, as the longer output volume forces more extraction to happen, pushing past the fast-extracting acid phase. Preinfusion is important here: the dense, light-roasted SL28 puck needs time to saturate evenly before full pressure hits, or the SL34's citric acidity concentrates in channels.

Troubleshooting
sour: Grind finer by ~10μm and raise temp by 1°C to 94°C. Espresso amplifies SL28/SL34's citric intensity — a shot running sour here means extraction stalled in the acid-dominant early phase. The tighter grind adjustment for espresso is smaller than filter (10μm vs. 22μm) to avoid dramatically spiking puck resistance.
thin: Increase dose by 1g or reduce yield by pulling a shorter shot. Light-roast Kenyan espresso runs toward low TDS because of the limited solubility ceiling at this roast level. Check that preinfusion is reaching the entire puck — a dry spot in the bed will leave you understrength regardless of recipe.
Moka Pot 79/100
Grind: 280μm Temp: 100°C Ratio: 1:9.0-1:10.0 Time: 4:00-5:00

The Moka Pot lands at 79/100 — it works, but the steam-pressure mechanism creates specific challenges for this Kenyan. At 1-1.5 bar (compared to espresso's 9 bar), extraction is less efficient and more heat-dependent. The recipe compensates with 100°C pre-boiled water and a 280μm grind — the finest of any hot-brew method except espresso, necessary to achieve adequate surface area in the short contact window as water pulses through the basket. SL28/SL34's intense citric acidity concentrates easily in the moka pot's low-water-volume environment: the 1:9.5 ratio reflects this, but strong sour notes are still a realistic outcome if grind distribution is uneven. Pre-boiling the water is especially important here — starting with cold water means the grounds cook under rising steam temperature before extraction begins, degrading the cloudberry delicate aromatics before they can extract.

Troubleshooting
sour: Grind finer by ~22μm and ensure water is pre-boiled. At 1-1.5 bar, light-roast SL28/SL34 requires fine grounds to extract adequately in the moka pot's brief contact window. If the grind is already fine, check that you're removing the pot the moment sputtering begins — prolonged heat drives off the brightest volatile compounds.
thin: Add 1g coffee or reduce water by 15g. The moka pot's fixed basket volume means dose adjustments are constrained — don't compress or tamp. If the basket is already full, reducing water in the base is the more practical lever for this light-roast Kenyan.
strong: Reduce dose by 1g or increase water by 15g. SL28/SL34's intense soluble load can push TDS high in the moka pot's concentrated environment. Increasing base water slightly is the safer fix — decreasing dose too much risks losing extraction evenness in the basket.
French Press 76/100
Grind: 930μm Temp: 96°C Ratio: 1:14.0-1:15.0 Time: 4:00-8:00

The French Press scores 76/100 — the lowest match among hot-brew methods for this Kenyan. The core problem is the metal filter: it allows oils and colloidal fines to pass freely, and the cloudberry and mandarin zest notes of this light Kenyan are aromatic volatiles that fare better in a cleaner liquid matrix. The 930μm grind is significantly coarser than filter methods to avoid over-extracting the fines that are unavoidable at French press grind settings. The elevated temperature at 96°C compensates partially — the higher extraction rate drives more extraction from the coarse particles before the extended 4–8 minute steep concentrates fines-derived compounds excessively. The +0.5 ratio adjustment to 1:14.5 reflects the light roast's lower solubility; you need more coffee to reach target TDS through a metal filter.

Troubleshooting
sour: Grind finer by ~22μm and raise temp by 1°C. Even at 96°C with coarse grounds, light-roast SL28/SL34 can underextract in the French press's flat immersion environment. The finer adjustment shifts the balance toward later-phase Maillard extraction, pulling sweetness alongside the acids.
thin: Increase dose by 1g or reduce water by 15g. The 1:14.5 ratio accounts for light roast's lower solubility, but French press's metal filter passes fewer dissolved solids than paper into your TDS reading. If the cup tastes dilute, the ratio adjustment is more reliable than a grind change here.
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.