Onion Soup Au Gratin
3 cups meat broth. 6 medium-sized onions, chopped. ½ teaspoon salt. 4 tablespoons flour. 2 tablespoons cold water. Pepper. Toast. Parmesan cheese.
Cook the chopped onions in a small amount of water until tender. Add 2 tablespoons of fat from the meat broth or the same quantity of butter and let the onions cook down in this until they are yellow. Mix them with the meat broth and salt and thicken with the flour and cold water which have been blended. Cook for a few minutes. Season with pepper as desired. Pour the soup into bowls or soup plates, place on top a round or slice of toasted bread, and sprinkle grated cheese over the bread and soup. Serve at once.