Seven-Minute Frosting

Grrrrrgh!
Course : Frostings
From: HungryMonster.com
 

Ingredients:

2 large egg whites
1 1/2 cups sugar
1/4 Teaspoon cream of tartar
1/3 cup water
1 Teaspoon vanilla
 

Preparation:

Combine in top of double boiler over hot (not boiling) water. Beat with a rotary beater or hand-held electric mixer until mixture holds its shape (about 7 minutes). Fold in 1 tsp. vanilla. Frost cake when both cake and frosting have cooled.