Sauce for Fish

One cup of cream, two tablespoons butter, half a saltspoon salt, generous dash of paprika; one small onion, grated; one tablespoon of parsley, measured after mincing very fine. Heat the cream and butter. After it comes to a boil add the other ingredients and thicken with tablespoon of flour, blended smooth with either milk or water. Let this boil to cook the flour and beat in the juice of one lemon after removing it from the blaze.