Prudence Island Apple Icing
["1 apple, peeled and sliced", "1 c. sugar", "1 egg white", "juice of 1/2 lemon"]
["Combine all ingredients", "together.", "Beat", "with mixer at slow speed, gradually", "increasing to medium.", "Beat until thick and smooth and all graininess has disappeared."]
["apple", "sugar", "egg", "lemon"]