Source: FOSS Cooking (community recipes)
Heat the oil and butter together in a large frying pan over medium-high heat until the butter foams and the surface shimmers. This combination gives you flavour from the butter's milk solids whilst the oil raises the smoke point — you need both. Dice the onion finely and mince the garlic. Once the fat is hot, add them together and fry for 3 minutes, stirring often, until the onion softens and turns translucent at the edges. The aromatics release their sulphur compounds as they cook, building the flavour base that will anchor the finished beans.
Dust in the cumin and paprika now, stirring constantly for 45 seconds. This step matters: the heat blooms the spices' essential oils, multiplying their potency. If you add them later with the beans, they stay powdery and muted. You'll see the mixture darken as the paprika caramelises slightly — this is right. Taste and season with salt; you want to taste cumin clearly and paprika should give the mix a russet-brown colour, not a red one.
Pour in the beans and their liquid. This is the control point. If you want a coarse purée, use all the liquid. If you want something you can almost stand a spoon in, discard half. Reduce the heat to medium and begin mashing with a wooden spoon or potato masher, breaking the beans against the pan's side. Work methodically — you're not making a paste, but a rough, chunky mass where some beans hold their shape and others collapse into the cooking liquid. This releases their mashing|starch, which binds everything into a creamy, cohesive side dish.
Continue frying and folding for 5-8 minutes, scraping the base of the pan often to prevent scorching. The surface should look matte, not glossy with separated fat. Taste again. If the beans taste flat, add more salt; if they're one-note, a pinch more cumin usually rescues them. The beans are ready when they hold together as a mass but still move slowly in the pan when you push them.
Transfer to a serving bowl and serve warm with beans-mexican|totopos or alongside grilled meats and rice.
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