In a large saucepan saute onions, garlic, celery, and sweet potatoes in olive oil for about five minutes. Add seasonings except tamari, and the stock or water. Simmer, covered, fifteen minutes. Add remaining vegetables and chickpeas. Simmer another 10 minutes or so until all the vegetables are as tender as you like them.Check salt. Add tamari if it could use a little more. Serve alongside cornbread or a crusty harvest bread.