7-Minute Frosting
["1 1/2 c. sugar", "1/4 tsp. cream of tartar", "1/8 tsp. salt", "1/3 c. water", "2 egg whites", "1 1/2 tsp. vanilla"]
["Place sugar, cream of tartar, salt, water and egg whites in the top of double boiler. Beat with a hand held electric mixer for 1 minute. Place pan over boiling water, being sure that boiling water doesn't touch the bottom of top pan. Beat constantly on high speed with electric mixer for 7 minutes. Beat in vanilla. Frost your favorite cake."]
["sugar", "cream of tartar", "salt", "water", "egg whites", "vanilla"]