When the apple was left to cook, line a pie dish with the pastry. To do this, take 2/3 of the pastry and roll it into a large circle that is big enough to cover the bottom and sides of the dish.
Then loosely roll up the pastry and place it over the dish, and then line it. Cut away the extras.
Poke some holes and put the dish into the freezer.
Blind bake pastry for 15 minutes at 190C.
If the pastry has shrunk, use a sharp knife and trim the sides so that the pie is of equal height all over.
Brush the pastry case with the egg. Do a thorough job if you don't want soggy pastry.
Place the apples and pour the gravy over.
Cover with the remaining 1/3 of the pastry. Cut a few slits on the cover pastry.
Egg wash the top and sprinkle generously with raw sugar.
Bake for another 45 minutes at 180C until the top is golden brown.