Start the apple pie recipe by peeling and coring the Granny Smith Apples (3 pounds). Slice the apples into ¼ inch slices.
Melt unsalted butter (2 tbsp) in a large skillet over medium high heat and add the apple slices.
Then, mix the dry spices together. Sugar (1 cup), cinnamon (½ tsp), allspice (1/4tsp) and kosher salt (¼ tsp) pour the mixture over the apples and stir until the apples are coated in the pan. Continue cooking the apples for 3 minutes.
Meanwhile, mix flour (2tbsp) and cornstarch (2 tsp). Sprinkle this mixture over the apples and stir. Cook the apples another 3 to 4 minutes. Remove the apples from the heat and squeeze lemon juice (1 tbsp).
Remove the apples from the heat and cool the mixture completely.
When the apples have cooled, preheat the oven to 425 degrees
Unwrap the pie dough and flour lightly. Line a 9-inch pie pan with the bottom pie crust, pressing the dough firmly against the sides and bottom of the pie pan.
Fill the pie with the chilled apple pie filling, mounding it slightly in the center.
Cover the pie with the second pie crust, pinching the edges sealed.
Brush the pie with egg wash (1 large beaten egg), making sure you get all the edges.
Finally, sprinkle sugar (2 tbsp) over the top of the pie.
Bake the pie for 20 minutes and then reduce the heat of the oven to 375 degrees and cook for another 30 to 40 minutes. Cover the pie with foil if the crust is browning too quickly.
Cool the pie on the counter top for 2 hours before slicing.