Dark Arts Coffee

MASK OF THE MIRE - Nicaragua

nicaragua medium roast washed parainema, catuai, catimor
datesroasted almondscaramel

Most Nicaraguan specialty coffee gets a light roast. This one doesn't, and the choice has real flavor consequences. The medium roast pushes development past the acid-forward phase where chlorogenic acids are still breaking down into their more bitter byproducts, and deeper into the Maillard territory where melanoidin formation builds body and mouthfeel. Melanoidins — high-molecular-weight browning products that make up 10-18% of roasted coffee dry weight — contribute the viscous, syrupy texture and amplify the chocolate and caramel compounds already forming via Strecker degradation. That's the engine behind the dates and roasted almond character: leucine and valine converting to 3-methylbutanal and methylpropanal during roasting, landing in the dark chocolate and malty register. The variety blend makes this more interesting. Catimor carries introgressed Robusta genetics — it's a Timor Hybrid × Caturra cross bred for disease resistance. Catimor's Robusta lineage tends to push roasty, earthy notes that can read as herbaceous at light development, but medium roasting suppresses that character by pushing further through the Maillard phase. Parainema is a Sarchimor-group variety — also introgressed, also rust resistant, but with larger beans and better cup quality at altitude. Catuai (Mundo Novo × Caturra) contributes high yield and density. At 1,200m, this sits at the lower boundary of the HB altitude tier. The density is there but not as concentrated as the SHB coffees grown above 1,370m, which explains why the medium roast makes sense structurally: less soluble load at the start is compensated by deeper Maillard development rather than the bright acid expression a light roast would try to coax from the bean.
AeroPress 88/100
Grind: 410μm Temp: 83°C Ratio: 1:12.5-1:13.5 Time: 1:00-2:00

AeroPress leads the brewer rankings (88/100) for this bean because its pressure-assisted extraction at 83°C extracts the roast-developed medium roast without thermal over-extraction risk. Reducing temperature to 83°C — 9°C below standard pour-over targets — matters here because medium roast beans are more porous and soluble than light roasts; they don't need maximum thermal energy to extract. At 83°C, the roast-developed sweetness (dates character) and roast-developed compounds that contribute the roasted almond character extract efficiently while the lower temperature suppresses bitter compounds. The 410μm grind is finer than Chemex or Kalita targets but coarser than espresso, appropriate for the 1-2 minute AeroPress window. The +10μm Catimor modifier keeps the grind from running so fine that earthy or herbal earthy undertones emerge under pressure.

Troubleshooting
bitter: Grind coarser by ~22μm and drop temp 1°C to 82°C. At 83°C the medium roast extracts quickly — if grind is at the fine end or press time is slow, extraction runs past caramel and almond into dry distillates. Coarser grind shortens extraction before bitter compounds dominate.
thin: Add 1g coffee or reduce water by 15g. AeroPress's short brew window at 83°C extracts efficiently but the 1:13 ratio is already moderately rich. If body is absent, the Catimor Robusta genetics are underperforming — a denser dose increases TDS and amplifies the dates and almond register.
Clever Dripper 88/100
Grind: 540μm Temp: 92°C Ratio: 1:15.5-1:16.5 Time: 3:00-4:00

The Clever Dripper matches AeroPress at 88/100 for this medium-roasted Nicaraguan because full immersion at 92°C gives the roast-developed bean extended contact time to deliver its dates and caramel character through full dissolution rather than surface-level extraction. Where a V60 depends on continuous flow to extract, the Clever's 3-4 minute sealed steep lets compounds diffuse at their natural rate — important for the body-building medium roast, where body development requires time for high-molecular-weight roast-developed compounds to fully dissolve. The 540μm grind — coarser than V60 by 30μm — reduces fines that could over-extract under extended immersion contact, specifically guarding against the earthy or herbal character Catimor's distinct characteristics can introduce. Paper filter removes oils before serving.

Troubleshooting
bitter: Grind coarser by ~22μm and drop temp 1°C. Full immersion at 92°C extracts the medium roast aggressively — if the steep runs long (toward the 4-minute end) with a finer grind, dry distillates accumulate. Coarser grind at the same steep time reduces total extraction.
thin: Add 1g coffee or reduce water by 15g. Even in full immersion, the 1,200m altitude means moderate bean density — not the ultra-high-solubility of an SHB lot. If the cup lacks the expected caramel body, dose adjustment addresses TDS directly.
Hario V60-02 87/100
Grind: 510μm Temp: 92°C Ratio: 1:15.5-1:16.5 Time: 2:30-3:30

The 92°C temperature — 2°C below default — directly addresses the medium roast's extraction vulnerability: darker roasts have more soluble material and higher porosity, meaning hot water extracts more aggressively, including the bitter compounds responsible for bitter and ashy notes. Pulling back 2°C slows extraction at the bitter end of the sequence without significantly impacting the roast-developed compounds (dates, roasted almonds) that are already well-developed in this medium-roasted Parainema-Catimor-Catuai blend. The grind is set 10μm coarser (reaching 510μm) to account for the Catimor variety's introgressed Robusta genetics: coarser grind reduces exposure of any remaining earthy or herbal notes that Robusta parentage can introduce. At 1,200m this bean lacks the super-high-altitude density of an SHB lot, so it extracts readily — the slightly coarser grind and lower temp keep the cup from running past the sweet caramel register.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. At 1,200m, this medium roast extracts readily but if grind is too coarse relative to flow rate, water moves through before fully dissolving Maillard compounds. The dates and caramel character require adequate extraction depth to emerge past the initial acid phase.
thin: Add 1g coffee or reduce water by 15g. The slightly coarser grind (+10μm for Catimor) reduces surface area, which can lower TDS at target brew time. If the cup tastes dilute rather than clean, dose adjustment compensates more reliably than grinding finer for this variety blend.
Kalita Wave 185 87/100
Grind: 540μm Temp: 92°C Ratio: 1:16.5-1:17.5 Time: 3:00-4:00

The Kalita Wave's flat-bottom geometry is particularly useful for this HB-altitude Nicaraguan. At 1,200m, the bean density is moderate rather than extremely high — grounds settle into a flat, even bed efficiently, and the three drain holes distribute flow evenly without the channeling risk that lower-density beds can exhibit in a conical. The 540μm grind (+10μm for Catimor variety) runs coarser than V60 or AeroPress targets, protecting against any earthiness or herbal notes the Catimor's distinct characteristics might contribute under finer extraction. At 92°C and 1:17 ratio, the parameters lean slightly lean and cool — a deliberate combination to prevent the body-building medium roast from pushing into bitterness. The dates and caramel character emerge cleanly in this balanced format.

Troubleshooting
sour: Grind finer by ~22μm and raise temp 1°C. The Kalita's flat bed can drain quickly if grind is at the coarse end of the target range. For this medium-roasted Parainema-Catuai blend, slightly faster-than-expected flow means extraction stops before caramel and almond compounds fully dissolve alongside the initial acids.
thin: Add 1g coffee or reduce water by 15g. The 1:17 ratio sits on the lean side; combined with the coarser Catimor-adjusted grind, TDS can run low. If the roasted almond and caramel character is present but faint, concentrating the brew amplifies both body and flavor intensity.
Chemex 6-Cup 85/100
Grind: 560μm Temp: 92°C Ratio: 1:15.5-1:16.5 Time: 3:30-4:30

The Chemex's thick bonded paper filter creates an interesting tension with this bean. The dates and roasted almond character of a medium-roasted Catimor-Parainema blend are partly delivered through roast-developed compounds that build body and amplify chocolate and malty notes. The Chemex strips oils aggressively, reducing the aromatic compounds that reinforce nutty and caramel character. The 560μm grind (coarser than most pour-over methods) partially compensates: coarser grounds produce fewer fines, which reduces the fine sediment that thick Chemex paper would otherwise trap and over-extract. At 92°C and 1:16 ratio, the recipe prioritizes clarity of the caramel notes over body. The score of 85/100 reflects a real compromise — the Chemex cleans up this bean's Catimor's potential earthy character but at the cost of some roasted nutty depth.

Troubleshooting
thin: Add 1g coffee or reduce water by 15g. The Chemex's aggressive oil stripping removes body contributors that this medium-roasted Parainema-Catimor blend would otherwise deliver. If the cup feels hollow despite correct brew time, a richer dose rebuilds TDS without reintroducing the earthiness a metal filter would add.
sour: Grind finer by ~22μm and raise temp 1°C. The 560μm Chemex grind is deliberately coarse for Catimor's Robusta genetics, but if pour technique is fast, contact time drops and extraction stalls before caramel compounds develop. Finer grind at 92°C keeps extraction in the Maillard zone.
Espresso 85/100
Grind: 260μm Temp: 91°C Ratio: 1:1.5-1:2.5 Time: 0:25-0:30

At 91°C and 260μm, the espresso recipe for this medium-roasted Parainema-Catimor-Catuai blend positions parameters 2°C cooler and 10μm coarser than a standard medium-roast espresso dial-in. Both adjustments serve the same goal: prevent over-extraction of the darker-roasted roast-developed compound set. Medium-roasted beans extract under 9-bar pressure extremely efficiently — the the characteristics from decaf processing that developed through the roast-developed phase offers less resistance than a light roast, meaning hot shots run fast and bitter without lower-temperature damping. The +10μm Catimor modifier also matters under espresso: at very fine grind sizes, any earthy or herbal notes from Catimor's distinct genetic background concentrate dramatically in the shot. The dates and roasted almond character reads as dark chocolate and caramel under espresso concentration — expect a dense, confection-forward shot rather than fruit-bright espresso.

Troubleshooting
sour: Grind finer by ~10μm and raise temp 1°C. An early-extracting shot at 91°C can stop before the caramelization products fully dissolve if grind is slightly coarse. The Parainema variety's larger bean size may require finer calibration than Catuai or Catimor components.
bitter: Grind coarser by ~10μm and drop temp 1°C. The medium roast's higher porosity at 91°C under 9-bar pressure can over-extract quickly. Even small finer grind adjustments push extraction past caramel into dry distillates — back off 10μm before adjusting temperature.
Moka Pot 83/100
Grind: 360μm Temp: 98°C Ratio: 1:9.5-1:10.5 Time: 4:00-5:00

The moka pot recipe at 98°C base water and 360μm grind is the appropriate entry point for this medium-roasted Nicaraguan. Unlike the light-roasted Colombia above, this bean's medium development means sufficient porosity to extract efficiently even at moka pot's modest 1.5 bar pressure — the dates and almond character that develop through deep roast-developed reaction dissolve readily. The +10μm Catimor modifier (bringing grind to 360μm vs. 350μm default) reduces the fines that would make the puck over-compact under heat and pressure, a particular concern with Catimor's variable particle distribution. Pre-boiled water is critical: cold-start moka pot allows grounds to heat slowly in the basket, shifting extraction temperature profile toward over-extraction of bitter compounds at higher temperatures before adequate roast-developed extraction occurs.

Troubleshooting
sour: Grind finer by ~22μm and confirm pre-boiled water at low heat. Moka pot extracts medium roast in a narrow window — if heat is too high and brew rushes through, extraction can paradoxically under-extract because contact time is too brief despite high temperature.
strong: Reduce dose by 1g or increase water by 15g. Moka pot output at 1:10 is inherently concentrated — the dates and roasted almond character of this medium roast amplifies under concentration. If the caramel registers as harsh, diluting the output before drinking reveals the intended sweetness.
French Press 82/100
Grind: 1010μm Temp: 94°C Ratio: 1:14.5-1:15.5 Time: 4:00-8:00

French press scores 82/100 for this bean — a better fit than for the light-roasted Colombia because the medium roast's body development actually benefits from unfiltered brewing. Roast-developed compounds contribute body and mouthfeel; they pass through the metal French press filter and amplify the dates-and-caramel character in the way a paper filter would strip it away. The 1,010μm extra-coarse grind minimizes fines migration through the press filter, which matters for Catimor's distinct genetic background — at finer grind sizes, any earthy or herbal notes concentrate in the fines that accumulate in unfiltered sediment. At 94°C, the 4-8 minute steep extracts roast-developed compounds fully without pushing into bitterness, and the longer steep range allows you to taste-test at 4 minutes and decide whether to extend.

Troubleshooting
strong: Reduce dose by 1g or increase water by 15g. Medium roast French press concentrates melanoidins and Maillard products without the diluting effect of paper filtration — at 1:15, TDS can read stronger than expected. Reducing dose keeps the caramel register present without becoming overwhelming.
bitter: Grind coarser by ~22μm and drop temp 1°C. Extended immersion at 94°C can extract dry distillates if the grind generates fines from Catimor's variable particle distribution. Coarser grind reduces fines production and shortens effective extraction surface at the same steep time.
Cold Brew 78/100
Grind: 910μm Temp: 2°C Ratio: 1:6.5-1:7.5 Time: 720:00-1080:00

Cold brew earns 78/100 for this bean — meaningfully higher than the light-roasted Colombia's 30/100 — because medium roast's enhanced solubility allows cold water to extract adequately over 12-18 hours. The dates and caramel notes that emerge from deep roast development are carried by roast-developed body and sweetness compounds; cold water extracts these more successfully than it extracts the volatile citrus esters and light-roast acids of a delicate light roast. The 910μm grind (slightly coarser than cold brew default, +10μm for Catimor) reduces extraction of any earthy undertones over the long steep. At 2°C and 1:7 ratio, the concentrate delivers a smooth, low-acid expression of dates and chocolate that works especially well diluted 1:1 over ice.

Troubleshooting
flat: Grind finer by ~22μm and check water mineral content. Medium roast cold brew should deliver caramel and chocolate clarity — if it reads flat rather than smooth, extraction may be incomplete. Very soft water (low TDS) lacks the mineral ions that aid extraction; consider using filtered water with some mineral content.
thin: Add 1g coffee or reduce water by 15g. The 1:7 ratio produces a concentrate intended for dilution — if the resulting drink after dilution tastes watery, the extraction yield was insufficient. Catimor's coarser grind target reduces surface area somewhat; compensate with dose.