In a large saucepan cook the lamb and onion in hot oil until the meat is brown.
Stir water, dried tomatoes, Italian seasoning, salt, and pepper into the saucepan. Bring to boiling; reduce heat. Simmer, covered, about 45 minutes (or about 1 1/4 hours for beef, if using) or until the meat is nearly tender.
Stir mushrooms, green beans, carrot, and pasta into meat mixture. Return to boiling; reduce heat. Simmer, covered, for 15 minutes more or until meat, vegetables, and pasta are tender. Stir in tomato sauce; heat through.