Mrs. G. T. Halls' Chocolate Icing
["3 c. sugar", "3 Tbsp. cocoa", "2 Tbsp. white Karo syrup", "1 small can Carnation milk", "a little sweet milk"]
["Cook until 3 drops fall from spoon.", "Stir until cool enough to spread on layers."]
["sugar", "cocoa", "white Karo syrup", "Carnation milk", "sweet milk"]