In a soup pot, heat the EVOO, 2 turns of the pan, over medium-high heat. Add the sausage and cook until browned, about 5 minutes. Add the onion and cook until softened, about 2 minutes, then stir in the garlic and cook for 1 minute. Add the beans and escarole; season with salt, pepper and a little nutmeg. Add the chicken stock and 2 cups water, cover and bring to a boil.
Uncover the pot, stir in the pasta, lower the heat and cook until the pasta is al dente, 6 to 7 minutes. Remove from the heat and stir in the lemon peel. Top with lots of cheese.