If desired, roll out the dough scraps and use a knife or cookie cutters to cut out a few decorative shapes for the top.
Take your pie out of the fridge. Add your dough cutouts to the top. If you didn't cut out shapes from the top crust, add a few slashes so steam can vent during baking. Brush the top crust with the egg wash, then sprinkle a little granulated or decorating sugar over the crust.
Place the pie on the baking sheet and put it in the oven. (The baking sheet will catch any melting butter from the crust and fruit juice from the filling.)
Bake the pie for 30-35 minutes, until the top crust is deeply browned.
Drape a sheet of aluminum foil over the top (to prevent further browning) and bake the pie for about 15 minutes more, until you see the filling bubbling through the holes in the crust. Move the pie to a cooling rack.
Here's the hard part: let the pie COOL COMPLETELY—several hours or overnight! This is crucial for the juicy fruit filling to set. If you cut into the pie while it's hot, the filling will run out all over the place. Give it several hours, and point a fan at the pie to help it along.
Once the pie is cool, cut out slices and serve. They're really tasty with a dollop of sweetened whipped cream! Makes about 8 slices. Store leftover pie covered in the fridge.