Chill Ingredients: Keep everything cold! Chill your flour, Crisco, and mixing bowl for 15 minutes before starting.
Mix Dry Ingredients: In a large bowl, whisk together the flour, cream of tartar, and salt.
Cut in Crisco: Using a pastry cutter or your hands, cut the Crisco into the flour until it forms coarse crumbs.
Prepare the Liquid: In a small bowl, combine 4–8 tbsp cold water, the beaten egg, and vinegar. Stir well.
Form the Dough: Slowly add the liquid to the flour mixture, stirring gently until it holds together. Don’t overmix!
Chill the Dough: Shape the dough into two disks, wrap in plastic wrap, and chill for at least 30 minutes.
Roll and Use: Roll out the chilled dough on a floured surface, then fit it into your pie pan. Fill with your favorite pie filling and bake!