3 large egg whites, at room temperature
1 1/2 cups sugar
1/4 cup water
1 tablespoon light corn syrup
2 teaspoons pure vanilla extract
1/2 teaspoon cream of tartar
1/4 teaspoon salt
Chocolate Seven-Minute Frosting: Make Seven-Minute Frosting. Spoon into 3 ounces cooled melted semisweet chocolate and gently fold together.