SORREL SOUP (4)

1 potato, 1 small onion, 1 good handful of sorrel washed and chopped fine, a little butter, pepper and salt, 1/2 pint water, 1 gill milk. Peel, wash, and cut up the potatoes and onion, boil in the water till tender, and rub through a sieve. Return the mixture to the saucepan, add the milk, sorrel, butter, and seasoning. Simmer gently for 10 minutes, and serve.