White Mountain Frosting - cooking recipe

Ingredients

2 c. sugar
1 c. water
1/2 tsp. cream of tartar
4 egg whites (room temperature)
2 tsp. vanilla

Preparation

Place sugar in heavy saucepan.
Add water and cream of tartar. Bring to a boil without stirring.
Cook until syrup reaches 240\u00b0 on candy thermometer.
Beat egg whites with electric mixer.
Add vanilla and continue beating until almost stiff.
Still beating, add sugar mixture in fine stream.
It is important to add sugar mixture slowly.
Keep beating at high
speed until thick.
Frosts 2 (9-inch) layers.