one deep dish pie; filling adapted from Marion Cunningham's Fannie Farmer Cookbook and The Joy of Cooking
Prepare the pie dough and chill it for at least an hour or up to a couple days.
To peel peaches: bring a large pot of water to boil. Drop in the peaches, wait a minute, then transfer to an ice bath. As soon as you can handle them, knick the skin with a knife and peel, it should slip right off. If not, plunge back into the boiling water for another minute. If the skins are really stuck, like some of the peaches that make their way out here to Montana, peel them away the best you can with a paring knife.
Stir together all ingredients and let stand 15 minutes, stirring a few times.
Preheat oven to 425°F. Roll out pie dough rounds and fit bottom crust into deep-dish pie dish (9" diameter x 2" deep). Spoon in peach filling, dot with butter, and fit top crust. Place pie in refrigerator until oven is preheated.
Mix egg wash and brush over crust and sprinkle with raw sugar. Set pie dish on a rimmed baking sheet (to catch any drips) and bake 30 minutes at 425° then lower to 350° for 30 more minutes.