Ingredients

2 large egg whites 

1 1/2 cups sugar 

2 teaspoons light corn syrup 

1/4 teaspoon cream of tartar 

1/2 teaspoon pure vanilla extract 

Preparation

Combine egg whites, sugar, corn syrup, and cream of tartar with 5 tablespoons cold water in top of a double boiler. Fill bottom of double boiler with two to three inches water; top pan should not touch water. With water boiling vigorously, beat egg mixture using a hand mixer on medium low 4 minutes, then high 3 to 4 minutes. Remove from heat. Add vanilla; continue to beat until icing holds its peaks, 3 to 5 minutes more; do not overmix or icing can get grainy.