Powdered sugar sifted and mixed with water and the butter. Stir until smooth and glossy. If the mixture is put a little rum or rum, pineapple, apricot, punches or vanilla essence, will get their tastes. May instead be used to flavor caramel, or some 2-3 tablespoons fruit syrup - strawberry, raspberry, blueberry. With a few drops of lemon, tangerine or grapefruit, citrus will get option.