Place the beans to soak in cold water overnight. Starting with cold clean water enough to cover them fully, bring the beans to boil slowly with the cheese crust, pinch of salt and pepper and a “buquet garnì” made of aromatic herbs. Keep it simmering for about 1 hour and half.
Meanwhile in a large casserole, “sweat” the onion with celery, potatoes and carrots, a drizzle of oil and a pinch of salt.
Once the beans are well-cooked, take out the bouquet and cheese crust. Save some beans to use as garnish, and add the rest to the vegetables with all the water. Add the tomato concentrate, and let the soup simmer until the everything is soft and well-cooked.
Blend well and sieve it until smooth. Add the remaining beans, season with salt and pepper to taste and keep it aside warm.
Cook the pasta in salted boiling water until al dente; and drain straight away into the hot bean soup. If the “pasta and fagioli” is too thick, add some cooking water. Serve very hot, with a drizzle of extra vrgin olive oil, chopped rosemary and fresh chilly.