Divinity Frosting - cooking recipe

Ingredients

1 1/2 c. sugar
1/2 tsp. cream of tartar
1/2 c. water
3 egg whites
1 tsp. vanilla

Preparation

Combine the first three ingredients in heavy saucepan.
Cook over medium heat until clear, stirring constantly.
Cook, without stirring, until 240\u00b0 on candy thermometer or until threads.