Seven Minute Frosting - cooking recipe

Ingredients

2 unbeaten egg whites
1 1/2 c. sugar
2 tsp. cream of tartar
1/3 c. cold water
dash of salt
1 tsp. vanilla

Preparation

Place all ingredients, except vanilla, in top of double boiler (not over heat).
Beat 1 minute with electric or rotary 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.
Pour into mixing bowl, if you wish.
Add vanilla and beat until it is spreading consistency, about 2 minutes.