7-Minute Frosting
["2 large egg whites", "1/2 c. water", "1 tsp. vanilla", "1 1/2 c. sugar", "1 Tbsp. light corn syrup"]
["In a double boiler or in a large metal bowl with a hand-held electric mixer, beat together all frosting ingredients, except vanilla, until combined. Set mixture over a saucepan of boiling water and beat on high speed until it holds stiff, glossy peaks, about 7 minutes (depending on your mixer and the weather; this may take longer than 7 minutes, 10 minutes). Remove double boiler or bowl from heat and beat in vanilla. Beat frosting until cool and spreadable."]
["egg whites", "water", "vanilla", "sugar", "light corn syrup"]