3 c. (360 g.) all-purpose flour, plus more for rolling
1 c. (2 sticks) unsalted butter, cut into 1/2" pieces
2 tbsp. granulated sugar
1/2 tsp. kosher salt
1 tbsp. apple cider vinegar
8 tbsp. ice water
3 1/2 lb. assorted apples (such Granny Smith, Honeycrisp, and/or Gala), cored, peeled, thinly sliced
2/3 c. granulated sugar
2 tbsp. all-purpose flour
2 tbsp. fresh lemon juice
1 tsp. ground cinnamon
1/2 tsp. pure vanilla extract
1/4 tsp. kosher salt
2 tbsp. unsalted butter, cut into small pieces
All-purpose flour, for rolling
1 large egg
1 tbsp. water
Coarse sugar, for sprinkling