Prepare carrots and place in large pan. Add canned vegetable broth reserving 1/2 cup for dissolving corn starch.
Add Mushrooms,spinach, onions, barley, wheat, pepper. Cook until carrots are tender.
Add corn. Cook until corn is done. Dissolve corn starch in vegetable broth. Add this with canned tomatoes and simmer until broth is thick. Add salt if needed.