adapted from Marion Cunningham's Fannie Farmer Cookbook and The Joy of Cooking
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.
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.