In a large saucepan over medium heat, combine the first 13 ingredients; bring to a boil. Reduce heat; cover and simmer for 1 hour or until vegetables are tender. For dumplings, combine flour, cornmeal, baking powder, salt and pepper. Combine egg white, milk and oil; stir into dry ingredients. Drop into eight mounds onto boiling soup. Reduce heat; cover and simmer for 15-20 minutes (do not lift the cover).