Peel, pit, and slice peaches. Stir in sugar, flour, lemon peel, cinnamon, and nutmeg. Prepare pie crust. Transfer peach mixture to a pastry-lined pie plate. Add top crust. Cut slits. Brush top with a bit of egg white whisked with water, if desired, and sprinkle with sugar. Bake at 375-degrees for 45-50 minutes. (Place on top baking rack in oven for first half of baking time then transfer to lower rack.)