Seven-Minute Frosting
["2 unbeaten egg whites", "2 tsp. light corn syrup", "1/2 c. cold water", "1 tsp. vanilla", "1 1/2 c. sugar", "1/4 tsp. cream of tartar", "dash of salt"]
["Place all ingredients except vanilla in top of double boiler. Beat 1 minute with beater to blend.", "Place over boiling water and cook, beating constantly, until frosting forms stiff peaks, about 7 minutes (don't overcook).", "Remove from boiling water; add vanilla.", "Beat to spreading consistency at 2 minutes."]
["egg whites", "light corn syrup", "cold water", "vanilla", "sugar", "cream of tartar", "salt"]