cups all-purpose flour plus more to dust • granulated sugar • sea salt • COLD unsalted butter (2 sticks) diced into 1/4" pieces (me 225g) • ice water (me 2 Tbsp) • lbs Granny Smith Apples peeled, cored 6-7 apples (7 cups thinly sliced) (me 6 apples) • cinnamon (me 1/2 tsp) • unsalted butter (me 120g) • all-purpose flour • cup water • cup granulated sugar (me 1/2 cup) • egg + 1 Tbsp water, for egg wash