In a food processor, or a large bowl, add the flour and salt, and mix to combine.
Take the butter out of the fridge, and cut into small pieces. Add into the food processor, or bowl.
If you are using a food processor, pulse the flour and butter together, but enough to get it started. Do not over mix. If you are using a pastry cutter or fork, work the butter into the flour, until crumbled a bit, and the butter is all covered with flour.
Add the ice water, and combine the ingredients. Do not over mix. The ingredients should start to form together.
Once the flour and butter mixture is combined, form it into a ball, and then cut in half. Place the other half in the fridge to stay cool.
Using a flour surface, place your dough on the flour, and start to roll out, forming an even circle.
Place the rolled dough into the pie dish.
Using a fork, poke holes in the dough, which will allow the steam to escape while baking.
Add the apple pie filling, and top with butter.
Follow the same directions to complete the other half of the dough.
Place on top of the filling, and crimp the edges together.
Make a few cuts into the top of the pie, so steam can escape while baking.
Sprinkle the top of the pie with sugar.
Place on a sheet pan, and bake
Bake, uncovered, until the apples are tender. Let rest for about 20 minutes so the juices start to thicken.