Cooked Chocolate Icing
["1 1/2 c. sugar", "1 c. canned cream", "1/4 c. cocoa", "1/4 to 1/2 stick margarine"]
["Mix sugar and cocoa, then add canned cream and margarine. Cook until thick, approximately 10 to 12 minutes."]
["sugar", "cream", "cocoa", "margarine"]