What coffee should I buy for a moka pot?

For a moka pot, go for a medium to medium-dark roast with a medium-fine grind — finer than filter, coarser than espresso. The moka operates on steam at around 1.5 bar, requiring a coffee with solid body and controlled bitterness. A quality 100% arabica blend or an arabica-robusta (20-30% robusta) works perfectly. Very light roasts produce unpleasant acidity; very dark roasts, burnt bitterness.

The moka pot — that small aluminum or stainless steel percolator invented in the 1930s — holds a special place in Mediterranean and Belgian coffee culture. Although technically different from an espresso machine (1-2 bar versus 9 bar for espresso), it produces a concentrated, full-bodied, aromatic coffee that can rival espresso in intensity at a much lower cost.

The first selection criterion is roast level. The moka favors medium to medium-dark roasts (also noted medium-dark or "2-3" on roast scales). These levels offer a good balance of sweetness, body, caramel, and slight toasted notes without entering burnt territory. A very light roast — typical of specialty coffees intended for filter brewing — will produce a vibrant acidity that the moka's steam pressure exacerbates, making the cup unpleasantly sour. Conversely, a very dark roast will deliver charcoal notes that weigh down the profile.

The second criterion is grind size. The ideal grind for moka is intermediate: finer than V60 or Chemex, but significantly coarser than espresso. If the grind is too fine, the coffee clogs the filter, rises slowly, and overheats. Too coarse, and extraction is insufficient, leaving the cup lacking body. Most roasters selling pre-ground offer a dedicated "moka" option.

Coffee composition also matters. A quality 100% arabica — particularly Central American or South American arabicas (Colombia, Brazil) at medium-dark roast — suits the moka very well. For those who enjoy an even fuller, creamier cup, a blend incorporating 20-30% robusta (preferably quality Ugandan or Vietnamese origin) can be excellent: robusta adds crema, body, and caffeine.

Finally, freshness is decisive: ground coffee should be used within 2 weeks of opening; whole beans within a month of roasting. Specialty coffees roasted on demand by Belgian artisan roasters — sometimes found in curated selections at venues like 20hVin (La Hulpe) or La Cave du Lac (Genval) — offer a freshness that supermarket brands cannot match.