Tortellini Soup

1 medium onion
2 cloves garlic
1 pound Italian sausage
6 cups beef broth
1/2 cup water

2 Tablespoons balsamic vinegar

2 teaspoons Italian seasoning

1 cup carrots, chopped

1 (14.5oz) can diced tomatoes

1 (15oz) can tomato sauce

1 (16oz) package frozen tortellini

1/2 cup parmesan cheese

Saute' onions and garlic for 2-3 minutes, add Italian sausage and cook until done. Add beef broth, water, vinegar, Italian seasoning, carrots, tomatoes and tomato sauce. Bring to a boil, reduce heat and simmer uncovered for 30 minutes. Stir in tortellini. Simmer covered 30 minutes. Sprinkle with parmesan cheese just before serving.