Beat the egg whites in a large bowl and set aside.
In a separate bowl, beat the egg yolks with the sugar.
Mix together egg yolk mixture and melted butter, then the ground hazelnuts, then the flour, and Levito. The mixture will be very thick, resembling cookie dough.
Gently combine together the yolk mixture and the egg whites.
Bake in a 10 inch round pan for 350F for 35 minutes or until a toothpick comes out clean?