Seven Minute Icing
["2 egg whites", "1/3 tsp. cream of tartar", "3 Tbsp. cold water", "1 1/2 c. sugar", "1/3 tsp. salt"]
["Put ingredients in top of double boiler and beat with rotary beater for 7 minutes.", "(I always beat mine for a few minutes before I put it over hot water.", "I think it makes a smoother icing.)"]
["egg whites", "cream of tartar", "cold water", "sugar", "salt"]