Mix all the streusel topping together in a large bowl. Blend the butter into the flour with your hands, get your hands dirty. Use your fingertips to blend the butter in. Once combined and no flour is at the bottom of the bowl, cover and place it in the fridge.

Preheat the oven to 425℉.

Mix the sugar, flour and spices together in a bowl. Peel and slice the apples and toss them in.

Remove your Walnut Pastry Crust from the fridge and add the apple mixture. Top it with small pieces of the butter and bake for 20 minutes.

Remove from the oven and add the streusel topping. Press it into all the nooks and crannies. Reduce the oven to 375 and continue to bake for 40 - 50 minutes. Check to see that the topping isn't browning too much. Use a foil tent to cover if it is.

Remove from the oven and cool on a wire rack. The pie needs at least 3 to 5 hours to completely set. You can also refrigerate it to make sure the filling isn't soupy.

When ready to serve, warm slightly and top with caramel sauce.