Bring a medium pot of water to a boil, salt it, add the broccoli rabe and boil for 3 minutes. Drain and let cool.
In a soup pot, heat the EVOO, 2 turns of the pan, over medium-high heat. Add the sausage and cook, crumbling with a spoon, until browned, 3 to 4 minutes. Stir in the onion and garlic and cook until softened, about 5 minutes. Season with the nutmeg and salt and pepper to taste. Add the chicken stock, tomatoes and their juices and 2 cups water; cover and bring to a boil. Stir in the white beans and cooked broccoli rabe and return to a boil. Add the pasta and cook, stirring occasionally, until al dente. Top with the cheese.