Seven Minute Frosting
["2 egg whites", "1 Tbsp. light corn syrup", "5 Tbsp. water", "1 1/2 c. sugar", "1/4 tsp. cream of tartar", "1 tsp. vanilla"]
["Combine all ingredients except vanilla in top of double boiler.", "Beat one minute at high speed to blend; then place over boiling water and beat until mixture forms peaks when beater is raised, about 7 minutes.", "Remove from boiling water; add vanilla. Continue beating until thick enough to spread."]
["egg whites", "light corn syrup", "water", "sugar", "cream of tartar", "vanilla"]