Freshly grated Parmigiano-Reggiano for serving Soak beans in water for 8 hours or overnight; drain. Put onion, garlic, cheese rinds and thyme in a piece of cheesecloth and tie the top to create a pouch. Add it to a large pot with the 5 cups of water, beans, salt, pepper and a drizzle of olive oil. Cook over mediumlow heat until the beans are tender, 1–2 hours; test them, as some beans may take longer to cook. (If you’ve forgotten to soak the beans, you can cook them in a pressure cooker with all ingredients for 1 hour.)