Step 1: Heat olive oil, sauté garlic briefly, then remove. Cook onion, Italian sausage, and pancetta until browned (3 mins).
Step 2: Add mushrooms, cook for 2 mins.
Step 3: Pour in tomato sauce, add rosemary, and ½ cup water. Season and mix.
Step 4: Cover, cook for 5 mins. Uncover, adjust thickness.
Step 5: Cook pasta, add to sauce. Toss, serve with parmigiano-reggiano and parsley.