Martha Stewart's Mile-High Apple Pie Is Apple-solutely Amazing

Name: Martha Stewart's Mile-High Apple Pie Is Apple-solutely Amazing
Cook time: 45 min
Total time: 45 min
Cuisine: American
Ingredients: ¼ cup plus 2 Tbsp all-purpose flour, plus more for dusting; 1 recipe basic pie dough (enough for top and bottom crust); 5½ lb firm tart apples (about 16), such as Empire or Granny Smith; Juice of 2 lemons; 1 cup granulated sugar; 2 tsp ground cinnamon; 3 Tbsp cold unsalted butter, cut into small pieces; 1 large egg yolk; 2 Tbsp water; Sanding or granulated sugar, for sprinkling; Vanilla ice cream, for serving (optional)