Apple Crumb Pie

Check For the crust:

Check 1 1/4 cups all-purpose flour, plus more for the work surface

Check 3/4 teaspoon kosher salt

Check 1 1/2 teaspoons granulated sugar

Check 6 tablespoons unsalted butter, cold and cut into pieces

Check 3 tablespoons solid vegetable shortening, cold

Check 3 to 6 tablespoons ice water

Check For the filling:

Check 1 pound Cortland, Empire, or McIntosh apples

Check 2 pounds Granny Smith apples

Check 1/4 cup fresh lemon juice

Check 1/4 cup granulated sugar

Check 2 1/2 teaspoons ground cinnamon

Check 1/2 cup (about 2 ounces) walnuts, finely chopped

Check For the topping:

Check 1 cup all-purpose flour

Check 1/4 cup packed dark brown sugar

Check 1 teaspoon ground cinnamon

Check pinch of kosher salt

Check 8 tablespoons (1 stick) unsalted butter, cold and cut into pieces