You may freeze the uncooked pie, but don't brush it with egg or dust it with sugar beforehand. Place the pie in the freezer for 30 minutes, to harden it slightly, and then double wrap it with plastic wrap. Freeze for up to 6 months. When ready to bake, unwrap the pie and brush it with egg and sprinkle with sugar. Bake, from the frozen state, until golden brown, about 1 hour and 10 minutes.