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Icings and Fillings Boiled Icing

1 cup granulated sugar 1/2 teaspoon Royal Baking Powder 1/2 cup water white of 1 egg 1/2 teaspoon flavoring extract Boil sugar, baking powder and water until syrup spins a thread; pour very slowly into stiffly beaten white of egg and beat until smooth; add flavoring as desired. Spread immediately on cake.