Puff pastry
Sugar
Granny smith apples
Egg yolk
Butter
Cinnamon sugar
Apricot jam
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).