Melt butter; add onion, celery, green pepper and garlic. Sauté covered until limp, then add tomatoes, green beans, carrots, sausage, water and broth. Let simmer 1 hour, stirring occasionally. Then add eggplant, tortellini, zucchini and herbs.
Simmer 15-20 minutes or more until tortellini is tender. Salt and pepper to taste. Makes 3 quarts.