Double Boiler Frosting - cooking recipe

Ingredients

2 egg whites
1 1/2 c. sugar
1/4 tsp. cream of tartar or 1 Tbsp. light corn syrup
1/3 c. water
1 tsp. vanilla

Preparation

Place first 4 ingredients over boiling water and beat with rotary beater until mixture stands in stiff peaks.
Scrape bottom and sides of pan occasionally.
Fold in vanilla.
Frost as usually done.