with borlotti beans in tomato, garlic, and sage (borlotti beans are also called Roman beans, Romano beans, or cranberry beans)
Heat the olive oil in a wide skillet or shallow pot over medium-low heat.
Add the garlic and sage. Cook gently for about 1 minute, just until fragrant. Do not let the garlic brown.
Add the crushed red pepper if using. Stir in the tomato purée, water, salt, and black pepper.
Simmer the sauce for about 10 minutes, partially covered, until it thickens slightly.
Add the drained borlotti beans and stir carefully so they do not break up too much.
Simmer very gently for 12 to 15 minutes, adding a splash of water if needed. The dish should be soft and saucy, not dry.
Taste and adjust salt. Let it rest 5 minutes before serving.
