Sopa Negra (Black Bean Soup)

Method

Drain the soaked beans and add them to a heavy pot with the stock, quartered onion, garlic cloves, pepper, carrot, celery, and bay leaf. Do not add salt yet — it hardens the bean skin and extends cooking time. Bring to a rolling boil uncovered, then drop the heat to a steady simmer. The beans will cook in their own starch-thickened liquid, absorbing flavour from the aromatics and the costa-rican-cuisine tradition of building depth through long, gentle cooking. Skim any grey foam that rises in the first five minutes; this is denatured protein and bean debris that clouds the broth.

After 90 minutes, begin tasting. The beans should collapse entirely between your tongue and the roof of your mouth — no firmness, no chalky centre. This takes 1.5 to 2 hours depending on bean age (older dried beans take longer). The liquid will darken and thicken as the beans release their phenolic compounds and starches. When they're genuinely soft, fish out the bay leaf and roughly half the cooked vegetables — the onion, carrot, and celery — and discard them. These have given their savour to the broth.

Toast the cumin in a dry pan for 30 seconds until fragrant, then add it to the pot. Use a hand blender to process the remaining beans and liquid, working it to a loosely textured purée with visible bean fragments still visible — the texture matters more than absolute smoothness. If you want a completely smooth finish, blend longer, but the rustic version is more interesting. Stir in the olive oil now; the emulsion will give the soup a luxurious mouthfeel. Taste and season decisively with salt and pepper. The soup should taste bold.

Ladle into warm bowls. Top each serving with a generous dollop of sour cream or crème fraîche — the cold dairy cuts the earthiness of the beans — and scatter fresh coriander over. The bright anise note of the coriander is the traditional finish in costa-rican-cuisine, sharpening what would otherwise be a flat, heavy soup. Serve immediately.