ONION SOUP

1 small Spanish onion, 1 medium-sized potato, 1/4 oz. of butter, pepper and salt and a pinch of mixed herbs, a little milk. Cut up the vegetables and cook them in 1/2 pint of water, adding a little herbs. When tender, rub the vegetables through a sieve, return the soup to the saucepan, add the butter and seasoning, and serve.