Double Boiler Frosting - cooking recipe

Ingredients

2 egg whites (1/4 c.)
1 1/2 c. sugar
1/4 tsp. cream of tartar or 1 Tbsp. light corn syrup
1 tsp. vanilla

Preparation

Place over boiling water and beat until mixture stands in stiff peaks.
Scrape bottom and side of pan occasionally.
Fold in 1 teaspoon of vanilla.