You begin, as always, with a soffrittoby sweating a thinly sliced onion in olive oil until translucent, then add a small head of escarole, sliced into very fine ribbons. Cover and allow the escarole to reduce, mixing from time to time so they absorb the flavor of the soffritto.
Then add the boiled or canned cannellini or borlotti beans, along with enough water or broth to cover the ingredients. Cover and allow to simmer until the escarole and beans are quite soft, about 15-20 minutes. If, like me, you like a thick soup, then along the way crush some of the beans with a wooden spoon against the side of the pot.
Place slices of day old bread, either toasted or fried in olive oil if you like, in the bottom of your soup bowls, then pour the soup over. Drizzle with un filo d'olio, top with a generous grinding of black pepper and serve.