Bring 6 quarts water to a boil and add 2 tablespoons salt.
Preheat oven to 400 degrees.
Cook pasta according to package instructions but remove 1 minute early. Drain
with cold water and drain again and set aside. Place cool cooked sausage in food processor
until ground but not much. Place in a large mixing bowl and add prosciutto
, 1/2 cup grated cheese and 1/2 cup chopped parsley and mix well. Season with salt and pepper and carefully stuff, using a piping bag or a small spoon, into pasta tubes. Layer pasta tubes in an oiled 8-inch by 10-inch baking dish
, alternating with tomato sauce and grated cheese
, until dish is full. Place in the oven and cook 15 to 20 minutes until golden brown and crispy on top and serve.