Alphabet Soup

1 onion, chopped
1 clove garlic, chopped
2 celery stalks, chopped
9 C low-sodium beef broth
1/4 C lentils
1/4 C split peas
1/4 C barley
1 can (8 oz) low-sodium tomato sauce
3 C mixed vegetables (such as string beans, carrots, corn, potatoes, spinach)
2 tsp basil
1 tsp oregano
1/2 C alphabet macaroni
1/2 green cabbage, coarsely shredded

Sauté onion, garlic, and celery until tender but not brown; set aside. Bring broth to a boil. Add lentils, split peas, and barley. Cook for 15 minutes. Add onion mixture, tomato sauce, mixed vegetables, and herbs. Cook for 15 minutes, or until lentils and split peas are tender. Stir in macaroni and cabbage; cook until tender. Add more water during cooking if necessary. Serve hot.