Seven Minute White Frosting
["1 1/2 c. sugar", "2 egg whites", "1 Tbsp. light corn syrup", "1/4 tsp. cream of tartar", "1/4 c. plus 1 Tbsp. cold water", "1 tsp. vanilla extract"]
["Combine sugar, egg whites (at room temperature), syrup and cream of tartar in top of a large double boiler; add water and beat on low speed of electric mixer for 3 seconds or just until blended."]
["sugar", "egg whites", "light corn syrup", "cream of tartar", "cold water", "vanilla extract"]