Combine sugar, water and corn syrup in small saucepan.
Bring to boil and boil hard, without stirring, to 242 degrees (syrup spins 6-to 8-inch thread when dropped from the tines of a fork).
Beat egg whites until stiff.
Pour hot syrup in a thin stream into egg whites, beating constantly.
Continue beating until stiff peaks form.
Blend in vanilla.