APPLE SOUP

1 large cooking apple, 1 small finely chopped onion, seasoning and sugar to taste, a little butter, 1 teaspoonful of cornflour, 1/2 pint of water. Peel and cut up the apple, and cook with the onion in the water till quite tender. Rub the mixture through a sieve, return to the saucepan, add the butter, seasoning and sugar, thicken the soup with the cornflour, and serve.