Most Colombian specialty lots are roasted light — the washed processing and high-altitude acidity profile lends itself to that treatment. MEJOR lands at medium, which is a deliberate choice with chemical consequences worth understanding.
The roasting sequence matters here. First crack happens around 196°C. Development time — the phase between first crack and drop — controls organic acid balance. At medium roast, the roaster extends that development window past where a light roast would stop. Chlorogenic acids continue breaking down into quinic acid and caffeic acid. The citric and malic acids that dominate bright light-roast Colombian cups also degrade with extended development. What grows in their place: Maillard compounds — the nutty, caramel, and chocolate flavors produced when amino acids and reducing sugars react at higher temperatures.
At 1,800 meters, right at the median altitude for Colombian specialty, Popayán's smallholders are producing beans with a solid soluble concentration — enough solubles for medium roast to work without the cup going flat. The washed process keeps the flavor clean and focused on what the roast development builds rather than any fruit-fermentation character.
The result is a cup profile that sits where [espresso and drip coffee](/blog/espresso-vs-drip-coffee) both work well — medium roast's development gives it the body and Maillard sweetness that espresso rewards, while the washed clarity keeps it from turning muddy in a longer drip extraction. That's partly why medium roast persists as a format for accessible Colombian lots: it's genuinely versatile in a way that light-roasted, high-acid coffees aren't.
Pushed past the sweet spot of medium development, CGAs decompose into quinic acid — the harsh, bitter compound that also accumulates in coffee sitting too long on a hot plate. At the correct development time, this lot avoids that entirely.
AeroPress's 83°C brew temperature is positioned 9°C below boiling — a significant drop that controls the rate at which medium-roast Castillo's slightly degraded CGAs extract. At medium roast, enough CGA remains in the bean to produce noticeable bitterness at higher temperatures; the 83°C cap keeps extraction in the sweet spot where Maillard caramel compounds dominate rather than bitter compounds. The 400μm grind and 1:00–2:00 steep gives the cup a body density that the washed process alone wouldn't produce — immersion contact ensures the melanoidins built during medium development fully dissolve. For MEJOR in particular, where no flavor notes are listed and the cup is entirely roast-driven, the AeroPress's pressure press at the end sharpens clarity and brings the caramel character into focus.
Troubleshooting
bitter: Grind coarser by ~22μm and drop temp 1°C to 82°C. At medium roast, Castillo's CGA profile is partially degraded but still active — AeroPress's pressure-assisted extraction can accelerate bitter compound extraction. Both adjustments together are more effective than either alone.
thin: Add 1g dose or reduce water by 15g; switch to metal filter for more body. MEJOR's washed clean profile needs dose to build TDS — there's no processing-derived body to compensate for under-dosing. Metal filter also retains the coffee oils that paper strips, adding mouthfeel.
The Clever Dripper's full immersion during steep gives MEJOR what the V60's continuous drainage doesn't: complete control over contact time with every particle simultaneously exposed to the same temperature water. For this washed medium Castillo, where the flavor story is entirely Maillard-driven, that uniformity matters — every ground particle should be extracting caramel and chocolate compounds at the same rate. The paper filter then drains cleanly at the 3:00–4:00 mark, removing oils for a clean finish that complements the washed base character. At 530μm and 92°C, the recipe matches what you'd dial for Kalita Wave; the key difference is that you control the drain time precisely rather than relying on a continuous pour. This makes Clever Dripper particularly forgiving for home brewers learning to work with Colombian medium roasts.
Troubleshooting
bitter: Grind coarser by ~22μm and drop temp 1°C; release the valve at 3:00 rather than 4:00. MEJOR's medium roast development leaves enough residual CGAs that full 4-minute immersion at 92°C pushes extraction toward dry-distillate bitterness. Releasing early preserves the caramel-chocolate balance.
thin: Increase dose by 1g or reduce water by 15g. For a washed bean with no processing-derived body, TDS is entirely dependent on dose. The 18g Clever recipe is calibrated for MEJOR's 1,800m soluble density — going below 17g produces a noticeably lighter, less satisfying cup.
MEJOR at 1,800m sits near the Colombian specialty median altitude, and the washed process means there's no fermentation-derived body to lean on — every flavor compound comes directly from what the roast built. The V60's technique-sensitive pour demands attention to where you are on the extraction curve. At 92°C and 500μm, the recipe targets the sweetness range — caramel and chocolate from amino acid-sugar reactions — that medium roast on a Castillo lot produces. The V60's fast central drain means a 2:30–3:30 window; the caramel compounds land in the middle of that window, so a total drawdown closer to 3:00 gives the best balance. This is not a fruity cup: without processing-derived sweetness, the flavor story here is the roast's development work at the acid-to-caramel transition.
Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. At medium roast, washed Castillo's citric and malic acids are partially degraded but not eliminated — fast V60 drawdown captures only the acid fraction. Finer grind slows flow so caramel and chocolate Maillard compounds have time to extract and balance the cup.
thin: Add 1g dose or reduce water by 15g. MEJOR has no honey or natural mucilage-derived body — the cup's weight comes entirely from melanoidins built during medium-roast development. If dose is low, TDS drops and the cup reads as watery with nothing to compensate.
The Kalita Wave's flat-bottom design produces the most even extraction of any pour-over, which is particularly valuable for washed Castillo from multiple smallholders: slight lot-to-lot variation in cell density is averaged out when water contacts the entire bed uniformly. At 530μm and 92°C, with 20g in 340g water at roughly 1:17, the recipe targets the caramel-chocolate Maillard profile that medium development builds at 1,800m. Pulse pouring — the Kalita's standard technique — is especially well-suited here because it redistributes the concentration gradient between additions, preventing the high-soluble early pulses from channeling through the flat bed. The flat-bottom's forgiving nature is the main reason Kalita outperforms V60 for consistency when the brewer isn't pouring at competition speed.
Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. MEJOR's washed process means all acidity is intrinsic to the bean chemistry — no fruit or honey character is present to soften sourness. Underextraction here is pure citric-acid dominance. Finer grind and higher temp pull the caramel compounds that balance it.
thin: Increase dose by 1g or reduce water by 15g. The Kalita's even extraction is excellent but doesn't manufacture body — at 1,800m, MEJOR has adequate soluble density, but you need the full 20g dose. Reducing dose by even 1g drops TDS noticeably in a clean, oil-free pour-over.
The Chemex's heavy paper filter strips oils completely, giving MEJOR the cleanest possible expression of what medium-roast Castillo actually tastes like. For a bean with no listed flavor notes and a purely roast-developed profile, this is revealing rather than reductive: the washed process was designed for exactly this kind of clarity. At 550μm the flow through the thick Chemex filter takes 3:30–4:30, which is enough contact time for the Maillard compounds — nutty and caramel — to dissolve fully while keeping extraction short of the bitter compounds phase. Colombian Castillo at 1,800m has sufficient soluble density to survive the Chemex's slow, oil-stripping extraction without turning papery or thin, though under-dosing at 28g is the most common mistake with this combination.
Troubleshooting
thin: Increase dose by 1g or reduce water by 15g. The Chemex strips all oils — for MEJOR, which has no fermentation or honey processing to contribute body, melanoidins are the only texture source. The 28g dose is the minimum; going lower produces a thin, one-dimensional cup with no structure.
sour: Grind finer by ~22μm and raise temp 1°C. If total drawdown finishes before 4:00 through the Chemex filter, you're capturing mostly the acid phase of extraction. Finer grind adds resistance and extends contact time into the caramel and chocolate zones that medium development built.
Medium roast works well for espresso — the Maillard development gives it body and concentrated sweetness that straight-light washed Colombian can't match. What the recipe adds to that story: 91°C is 2°C below the default, specifically because medium-roast Castillo's more open cell structure extracts faster under pressure. The 1:2 yield ratio is the target sweet spot — pulling to 1:2.5 or beyond risks quinic acid extraction from the CGA decomposition that medium development left incomplete. Castillo's Timor Hybrid genetics behave like Bourbon group at the roaster, meaning physically dense beans that resist channeling at 9 bar better than the lighter-density Caturra or Catuai alternatives common in Colombian espresso blends.
Troubleshooting
sour: Grind finer by ~10μm and raise temp 1°C. Sour espresso from this washed Castillo is almost always a flow rate issue — the shot runs too fast, extracting only the initial acid fraction. The 10μm adjustment is precise; larger jumps with espresso grind can over-correct and choke the shot.
bitter: Grind coarser by ~10μm and drop temp 1°C to 90°C. Medium-roast CGA compounds extract aggressively under 9-bar pressure — bitterness here is quinic acid, not the pleasant dark-chocolate bitterness of proper development. Small grind adjustment, check shot time is 25–30 seconds.
Moka pot concentrates MEJOR at roughly 1:10, which means the medium-roast Maillard development — caramel and chocolate — arrives at amplified intensity. Unlike an intact light-roast washed Colombian, which can taste acidic and astringent when concentrated, MEJOR's medium development has already degraded most of the harsh chlorogenic acids. The 98°C pre-boiled water ensures extraction begins immediately when pressure builds rather than slowly cooking the grounds during heat-up. At 350μm, the grind is medium-fine — fine enough to build backpressure but not so fine that it chokes or over-extracts. For Colombian washed mediums, moka pot produces a shorter, concentrated drink where the nut and caramel notes read much more prominently than in diluted pour-over formats.
Troubleshooting
sour: Grind finer by ~22μm and confirm water is pre-boiled before adding to the base. Sour moka output from MEJOR means extraction ran short — either flow moved too fast through coarse grind, or slow heat buildup led to incomplete extraction before sputtering started. Pre-boiled water is especially important here.
strong: Reduce dose by 1g or add 15g water to the base. At 1,800m, MEJOR has strong soluble density for a Colombian washed medium — it doesn't need maximum dose to produce intensity. Overdosing at moka pot's 1:10 ratio produces an overpowering, syrupy result.
French press is the only common home method that passes all coffee oils into the cup — for MEJOR, a washed Castillo with no listed flavor notes and purely roast-developed character, this means the melanoidins and caramelization products from medium development are expressed with full texture rather than filtered clarity. The coarse 1,000μm grind and 94°C temperature balance: coarse to prevent over-extraction in immersion, slightly hotter than pour-over to compensate for the reduced surface area. Using Hoffmann's extended wait — 5–8 minutes after pressing — lets grounds settle before pouring, which removes most of the sediment without sacrificing the oil-based body. For a bean where the primary story is roast development rather than origin character, the added oil-based texture French press provides makes the medium-roast caramel and chocolate more prominent.
Troubleshooting
strong: Reduce dose by 1g or add 15g water. This 1,800m washed Castillo has good soluble density — it extracts efficiently even at the French press's coarse 1,000μm grind. At the 1:15 ratio, dose sensitivity is high; 1g over target produces noticeably strong, concentrated output.
bitter: Grind coarser by ~22μm and drop temp 1°C. If steep extends past 6 minutes at 94°C, quinic acid from CGA decomposition accumulates significantly — this is the harsh bitterness distinct from the pleasant chocolate bitterness at correct extraction. Coarser grind and lower temp both help.
Cold brew is the lowest match (78/100) for MEJOR primarily because cold water struggles to extract the Maillard compounds that are this bean's main flavor story. Melanoidins — the body and texture compounds built during medium roast development — have poor cold-water solubility. What cold brew does extract efficiently is caffeine and early-phase acids. For a washed medium with no processing-derived sweetness, cold extraction leaves a thin, flat result unless you dose aggressively. The 80g in 560g water compensates for this. Steeping 12–18 hours at refrigerator temperature (2°C) catches the slow-phase extraction of residual caramel character that develops after the initial 7-hour caffeine/CGA equilibration. MEJOR works best as cold brew when you want a clean, low-acid Colombian concentrate for mixing.
Troubleshooting
flat: Grind finer by ~22μm and raise steep temperature to 4°C. Check bean freshness — stale medium-roast Colombian loses caramel aromatics fast. MEJOR's Maillard-only flavor profile has nothing left if the aromatic compounds degrade before cold brew steep begins. Use beans within 3 weeks of roast.
thin: Increase dose by 1g or reduce water by 15g. Washed Castillo has no honey or natural-process body to lean on in cold brew. The 80g dose is the minimum — cold water's poor melanoidin solubility means body is already limited, and under-dosing makes it irredeemably thin.