Granny smith apples
Preheat oven to 375 degrees. Open pastry sheet and remove paper then fold sheet back up.
Transfer to a baking sheet and then place in the freezer. Peel, core, and slice apples 1/4 inch think. Toss in a large bowl with sugar.
Brush pasty with egg wash, avoiding edges. Use a sharp knife to score a 3/4 border around pastry (do not cut all the way through).