Brown sausage; drain grease. Add onion and saute until golden. Add garlic and cook just a minute until fragrant. Add liquids, tomatoes, carrots, fennel, and herbs. Simmer on low for 30 to 45 minutes. Add zucchini and cook for an additional 20 minutes. Add Tortellini and cook an additional 10 or 15 minutes, or until pasta is cooked. Stir in fresh parsley and serve with Parmesan cheese on top.