Grandma Mary's Meringue Frosting

Why I Love This Recipe
A delicious frosting. She used it on Bill's birthday angel food cakes every year!
Ingredients You'll Need
2 cups sugar
2/3 cup water
1/2 teaspoon cream of tarter
4 egg whites
1 teaspoon vanilla
Directions
In a saucepan, combine sugar, water and cream of tarter. Bring steadily to a boil, then boil rapidly to 236 degrees (about 10 minutes) - soft ball stage.
Beat egg whites until stiff.
Pour syrup very slowly over egg whites, beating constantly.
Add vanilla and continue beating until frosting holds its shape.