Cut the shortening/butter into the flour and shortening/butter until it resembles coarse crumbs (I use my hands, you can use two knives or a pastry cutter to do this)

Add the apple cider vinegar and 3 tbsp water, and stir gently until it forms a dough.

To roll the dough, find a clean counter space or use plastic wrap on a table and lightly sprinkle with flour.

Place the dough ball in the middle of the surface, sprinkle it with flour, and starting from the middle, roll it outwards in a circle of about 12". Keep sprinkling the dough with flour as needed to prevent the dough from sticking to the rolling pin, or put another layer of plastic wrap on top of the dough and roll over that.

Place the dough in a greased 9" pie tin.

Preheat the oven to 400F.

Combine all the filling ingredients in a medium bowl using a wooden spoon or electric beaters, then pour in the prepared dough and place in the preheated oven for 15 mins.

Reduce the oven temperature to 350F and bake for an additional 40-50 minutes. The pie will set after removed from the oven, it is cooked through when a knife inserted in the center of the pie comes out clean.