Step 1

Heat the olive oil in a large, deep skillet over medium heat. When the oil is hot, add the sausage and cook until it starts to brown, about 5 minutes. Add the onions and cook until softened and translucent and the sausage is well browned, another 5 to 7 minutes. Add the oregano, fennel seeds, red pepper flakes, garlic and some salt and black pepper and stir again.

Step 2

Next, add the broth, tomato puree and tomato paste and stir well. Add the uncooked pasta into the sauce, bring to a simmer and cook, stirring occasionally, until the pasta is al dente, 15 to 20 minutes.

Step 3

Remove from the heat and stir in the mozzarella and mascarpone. Taste and add more seasoning if necessary. Serve with shaved Parmesan and torn basil leaves.