Mix together the crumbs, 1/3 cup of the sugar and the pecans. Beat the egg whites until they are stiff, gradually adding the other 1/3 cup of sugar and the vanilla. Add this to the crumb mixture. Pour it into a greased pie pan and bake it at 350 °F for 30 minutes. When it has cooled, mash it down to the shape of the pan. Fill the crust with ice cream and freeze it. Thaw it slightly before serving, and top with your favorite fruit.
