Yam Tomato Soup 2 yams, peeled, sliced 1 onion, peeled, sliced 4 tomatoes, sliced 6 cups water 1 cup milk, scalded 1 tablespoon butter seasonings to taste Put all ingredients, except the milk, in a kettle. Cover. Cook for about 40 minutes. Pass through a sieve. Put mixture back in kettle and bring slowly to a boil, stirring constantly. Add gradually the scalded milk. Then serve