TOMATO SOUP

1 teacupful of tinned tomatoes, or 6 oz. of fresh ones, 1 teaspoonful of cornflour, 1 small onion, pepper and salt to taste, and a little butter. Chop the onion up fine, and cook the tomatoes and onion in enough water to make 1/2 pint of soup. When cooked 15 minutes rub the vegetables through a sieve; return to the saucepan, boil up, thicken with the cornflour smoothed with a spoonful of water, and add a little piece of butter; serve with sippets of toast.