Using a glass or tin pie pan lightly grease with cooking spray or oil
Take one piece of the pastry and roll out just enough to fit around the pan. Place it in the tin and stab it a couple of times on the bottom. Place it in the refrigerator.
Peel, core, and dice apples into one inch or so pieces and squeeze the lemon over the pieces to keep them from browning while you dice.
In a large bowl, mix the diced apples, sugar, and cinnamon together. *See Notes Below #1
Take the pie pastry out of the refrigerator and pour the apple mixture into the pan. Level it out a bit.
Making sure that the butter is cold, cut and dice it up. Then add it to the apple mix.
Roll out the second sheet of pastry slightly and lay it on the top of the pie mixture. Curl the edges inward and tuck them in the sides of the pie plate and press down.Cut a couple of slits on the top.*See Notes Below #2
Beat one egg and brush the top of the pastry. At this point you can add a bit of sugar to the top.
Bake at 400° turning halfway through the bake. Keep a watch around the 15 minute mark or so. You do not want it to burn.
The longer you cool this, the more it will set up. If you like it hot just note that it will pour out. Cooling it until just warm comes out pretty nice.
#1: Setting aside the mix lets the seasons marinade for a bit. You can add any seasoning you like at this time aside from cinnamon.#2 I rarely cut the pastry dough around the pie tin. Just tuck it in and press it down. If you don't like all the pastry, you can cut it and then press it down.