White Mountain Frosting
["2/3 c. sugar", "2 2/3 Tbsp. water", "1/3 c. light corn syrup", "3 egg whites", "1 1/2 tsp. vanilla"]
["Mix in saucepan and keep covered first 3 minutes, then cook to 242\u00b0 on thermometer.", "Beat 1/3 cup or 3 egg whites until stiff, while syrup is cooking.", "Pour syrup slowly over whites and add 1 1/2 teaspoons vanilla."]
["sugar", "water", "light corn syrup", "egg whites", "vanilla"]