Pineapple Icing
["1 can crushed pineapple", "1 1/2 c. sugar", "1 egg, beaten", "1 Tbsp. plain flour", "1 stick butter"]
["Mix all ingredients", "except", "butter", "and cook over slow heat until thick.", "Add butter and cool."]
["pineapple", "sugar", "egg", "flour", "butter"]