Most Guatemalan specialty coffee is washed — 71% of the specialty production in the country. Natural processing here is the first departure from the norm. Medium roast is the second. Together they define a cup that sits in a different space from the light-washed Guatemalans that dominate the category.
Natural processing means the whole cherry dried intact, with fruit pulp and mucilage intact around the seed. Fermentation happens at the cherry surface over weeks, not in a water tank over hours. What gets into the bean is a range of fermentation-derived volatile esters — ethyl acetate, ethyl butyrate, and related compounds that produce the fruit character naturals are known for. The brown sugar and molasses here aren't purely roast products; they're partly fermentation-derived sugars and their breakdown compounds, amplified rather than stripped away.
Dried fig is the signature note for naturals that have undergone extended surface fermentation without defect — it's the fruit sugars concentrating and partially caramelizing on the drying bed. The nougat note is Strecker degradation: valine and leucine producing methylpropanal and methylbutanal during roasting, reading as nuttiness and caramel.
Medium roasting takes development further past first crack than is typical for Guatemalan specialty coffee. This has a specific consequence: chlorogenic acids — the primary bitterness source at light roast — decompose further into quinic acid. The brightness of a light roast gives way to fuller body and deeper caramelization. Melanoidin formation extends through the additional development time, building the syrupy mouthfeel that makes medium-roasted naturals work well with dairy and in espresso.
Pacas is a compact Bourbon mutation with a narrow roasting sweet spot. It roasts similarly to Bourbon but requires precise development time — push past the sweet zone and the flavors compress quickly toward flat and dull rather than building complexity.
Chemex at 90°C and 535μm is calibrated for a medium natural from 1,750m altitude with two compounding delta sources: the natural processing adds +15μm (coarser to account for natural-process particle behavior), but the altitude of 1,750m subtracts 30μm (denser, higher-altitude beans benefit from finer grind to ensure even extraction), netting -15μm from default. The Chemex's thick filter slows drawdown and strips oils, which for this medium-roasted natural means the brown sugar and molasses character comes through clean rather than with the heavier oil-borne compounds. Temperature is 90°C — 4°C below default — because medium roast Pacas develops darker caramelization compounds that extract faster than lighter roasts, and the natural processing further lowers the solubility window.
Troubleshooting
sour: Grind finer by ~22μm and increase temp by 1°C. Medium roast naturals can show deceptive sourness — the molasses and dried fig compounds are in the mid-to-late extraction fractions; if drawdown finishes too fast, you're drinking fermentation acids without the caramel resolution. Slow the grind, not the pour.
flat: Grind finer by ~22μm and increase temp by 2°C; check water mineral content. The nougat and brown sugar character in this Pacas natural depend on adequate mineral content for extraction. If your water is very soft (under 75 ppm hardness), those Strecker-derived caramel notes won't transfer fully.
The V60 at 90°C and 485μm handles this medium Guatemalan natural differently than it would a lighter bean. Pacas at medium roast has more developed browning compounds from extended roast development, which contribute body and mouthfeel. The V60's faster flow dynamics mean the caramelized sugar compounds (brown sugar, molasses) extract in the middle portion of the brew, where the conical bed's increasing hydraulic resistance as water drops creates a natural extraction curve that suits this bean. The altitude-driven -30μm delta is significant: 1,750m Guatemalan Pacas is denser than lower-altitude Guatemalan coffee, and the finer grind ensures even extraction through that density rather than channeling around it.
Troubleshooting
sour: Grind finer by ~22μm and increase temp by 1°C. At V60 flow rates, medium natural Pacas can channel if grind is inconsistent — fruity acids then dominate over the brown sugar base. A thorough 45-second bloom is particularly important for this natural-processed density.
flat: Grind finer by ~22μm and increase temp by 2°C. Flat usually means the nougat and dried fig are present but below perception threshold. These compounds need adequate temperature and surface area — ensure your kettle is at full 90°C (not cooling off mid-pour) before adjusting grind.
The Kalita Wave's flat-bottom, three-drain design creates the most consistent extraction uniformity of the three major pour-over methods, which matters for this Pacas natural. Pacas has a relatively narrow window where the roast develops its best flavors, and medium roast on this variety produces a specific character where the brown sugar, nougat, and molasses are the target zone — push past it and flavors compress quickly. The Kalita's even saturation across the flat bed means you extract that sweet zone consistently without hot spots or cold zones that could skew the profile. At 515μm and 90°C, the Kalita pulls the molasses and dried fig character that distinguishes this bean from lighter-roasted Guatemalan naturals.
Troubleshooting
sour: Grind finer by ~22μm and increase temp by 1°C. The Kalita's wave filter can develop flow issues if it collapses against the walls — don't pour directly on the filter edges. If channeling is suspected (fast drawdown), verify filter placement first, then close the grind.
flat: Grind finer by ~22μm and increase temp by 2°C. Medium roast Pacas at 1,750m altitude needs adequate extraction to express the molasses depth — flat is almost always under-extraction at this roast level. Pre-warming the Kalita thoroughly (ceramic retains heat poorly) before brewing matters more than with plastic drippers.
AeroPress at 81°C — the lowest temperature across all methods for this bean — pairs with a 385μm grind to work within a method that compensates for low temperature through pressure assist at plunge. The Pacas at medium roast is less soluble than a light roast, and the natural processing adds dense fermentation-derived compounds; the combination makes 81°C a conservative choice that prevents the bitter compounds from over-extracting while the 1-2 minute steep allows the brown sugar and caramel compounds time to transfer. AeroPress also scores 87/100 here — tied for the second-highest match — because the concentrated format at 1:12.5-13.5 ratio amplifies the molasses and nougat character that medium roast Guatemalan naturals express well. The paper filter keeps the nougat clean rather than oil-laden.
Troubleshooting
strong: Decrease dose by 1g or increase water by 15g. Medium natural Pacas has moderately high solubility given the roast level — AeroPress concentration can tip into over-intensity quickly. The molasses note in particular becomes cloying at high TDS rather than resonant.
bitter: Grind coarser by ~22μm and decrease temp by 1°C. At medium roast, Pacas has developed more dry distillate compounds than a lighter-roasted counterpart. If bitter notes appear, the extraction is pulling from the late-phase compounds — coarsening the grind shortens the extraction window.
The Clever Dripper's immersion format is particularly well-matched to a medium natural at high altitude because the full-saturation steep extracts the brown sugar and molasses compounds — which develop in the middle of the extraction — more completely than a fast-flowing V60. For Pacas at medium roast, where the flavor target is the caramelized sweetness (brown sugar, nougat) rather than the early fruity acids or late bitter compounds, immersion's even water contact during steep time pulls that zone cleanly. At 515μm and 90°C, the 3-4 minute steep mirrors the Chemex total brew time but through immersion mechanics. The dried fig and molasses notes from extended natural processing are better expressed when every particle has equal water access rather than when they depend on pour technique.
Troubleshooting
strong: Decrease dose by 1g or increase water by 15g. The Clever's immersion phase extracts this medium-roast natural efficiently — if TDS reads high, try releasing the valve at 3 minutes rather than 4 before adjusting the recipe, as extended steep time compounds strength in immersion.
bitter: Grind coarser by ~22μm and decrease temp by 1°C. In immersion, over-extraction of medium natural Pacas looks like the nougat and brown sugar getting a harsh edge. The 4-minute steep ceiling matters here — don't extend beyond it, especially if water temperature holds above 90°C.
Espresso at 77/100 is the highest score among the concentrated methods for this bean, reflecting medium roast's increased compatibility with pressure extraction. Medium roast drives further development of browning compounds and melanoidins — both work in espresso's favor because at 9 bar, melanoidins contribute to crema body and mouthfeel, and the reduced bitterness from roast-derived compounds means less risk of sharp bitterness. At 89°C (4°C below default), the temperature targets the molasses and brown sugar compounds that dominate at medium roast without triggering the bitter extraction that would darken this toward bitter. The 235μm grind and 1:1.5-2.5 ratio produce a syrupy, dark-fruit-forward shot where the dried fig becomes dense and the nougat adds a confectionery quality.
Troubleshooting
strong: Decrease dose by 1g or pull toward the longer yield end of the range (1:2.5). Medium natural Pacas concentrates its brown sugar and molasses intensely at espresso TDS — a 1:2.5 ratio gives more sweetness and less density than 1:1.5. Start long.
sour: Grind finer by ~10μm and increase temp by 1°C. Espresso extraction for medium natural Guatemalan can show fruit-acid sourness if the shot runs too fast — the natural's fermentation esters extract before the caramelization compounds. Check puck evenness; channeling in naturals is common due to particle density variation.
Moka pot scores 68/100 — slightly higher than for lighter-roasted naturals — because medium roast's additional melanoidin development survives the thermal stress of steam-pressure extraction better than delicate floral aromatics would. The brown sugar and molasses character of this Guatemalan natural is robust enough to persist at the elevated temperatures moka pot imposes. At 335μm and 96°C effective water temperature, the brew concentrates those caramelization-derived compounds meaningfully. Using pre-boiled water in the base is critical: cold water start means the grounds cook in rising steam before brewing begins, which at medium roast can tip the brown sugar toward burnt-caramel or ashen territory. The metal basket passes the natural's oils through, adding body that complements the molasses weight.
Troubleshooting
strong: Decrease dose by 1g or add slightly more water to the base chamber. Medium roast Pacas natural carries more soluble content than a lighter roast — moka pot concentration amplifies this considerably. Remove from heat at first sputter; the molasses character turns harsh if extraction continues past that point.
sour: Grind finer by ~22μm. At moka pot's medium-fine range, the density variation from natural processing can create pockets of under-extraction even at high temperature. Consistent medium-fine grind — not espresso-fine — combined with level basket filling extracts brown sugar compounds before acids dominate.
French press at 92°C and 985μm uses full-immersion extraction suited to medium roast's different extraction requirements. Medium roast Guatemalan natural has more melanoidins and developed browning compounds — brown sugar, molasses — that benefit from the longer steep window and full-immersion extraction that French press provides. The metal mesh at this roast level passes oils that are heavier and more compound-dense than at light roast, contributing body that reinforces the nougat and molasses character. This bean's dried fig and brown sugar character are not primarily volatile — they're roast-developed compounds that French press extracts efficiently. The 4-8 minute steep window (Hoffmann's extended settling approach recommended) works with this bean's medium-roast solubility.
Troubleshooting
strong: Decrease dose by 1g or increase water by 15g. Medium natural Guatemalan in French press produces a denser cup than lighter-roasted beans — the extended melanoidin development at medium roast means more dissolved solids at equivalent ratio. Try 4 minutes steep versus 8 before adjusting dose.
bitter: Grind coarser by ~22μm and decrease temp by 1°C. Pacas's narrow sweet spot at medium roast tips into dry distillate bitterness if steep time runs long. Use Hoffmann's method: steep 4 minutes, then wait 5-8 minutes for grounds to settle before pouring.
Cold brew at 64/100 is the best score among the three lowest-ranked methods for this bean, and for a specific reason: medium roast Guatemalan natural has a flavor profile anchored in non-volatile caramelization products — brown sugar, molasses, nougat — that cold water extracts more readily than the volatile fermentation esters that define lighter naturals. The brown sugar and molasses compounds are large-molecular caramelization products that cold brew handles better than it handles aromatic volatiles. At 885μm and 1:6.5-7.5 ratio, the 12-18 hour steep produces a chocolate-forward, caramel-sweet concentrate where the dried fig character translates well. The flat/strong troubleshooting signals reflect the steeping challenge of a dense, medium-roasted particle rather than a fundamental flavor mismatch.
Troubleshooting
flat: Grind finer by ~22μm; check water mineral content. Medium natural Pacas needs adequate mineral content for cold extraction of its caramelization compounds — 150+ ppm total dissolved solids in the brewing water significantly improves extraction completeness. If water quality is good, grind finer before extending steep time.
strong: Decrease dose by 1g or increase water by 15g before dilution. The brown sugar and molasses compounds in this medium roast cold brew concentrate have higher solubility than lighter roasts. If the concentrate is very dense after 12 hours, dilute at 1:1.5 rather than 1:1 to maintain balance.