Fried green plantains dropped into a broth of onion, bell pepper, garlic and cumin with potato, where they soften without falling apart. Thirty-five minutes, five servings, and it is the best thing to do with patacones left over from another meal.
The plantains go in last and only for ten minutes. Longer and they stop being patacones and turn into a thickener: they break down, the soup goes cloudy and the pieces disappear. Stir gently for the same reason. This is a soup that changes as it sits, because the plantain keeps drinking broth even off the heat, so it is thinner the moment it is served and considerably thicker an hour later. Add more broth when reheating. Patacones fried the day before work perfectly here and are in fact the usual reason to make this, since they go hard once they cool and this is what rescues them.