Place flour, shortening, and butter in a food processor; pulse until the shortening and butter have been integrated and the mixture looks grainy. Store in the fridge in an airtight container. 

For a 9 inch crust, take out slightly less than 8oz and place in a mixing bowl. Add two or three teaspoons of water and start to stir it in until the mix comes together into a dough - add more water if it crumbles apart too easily, or more of the flour mix if it is too wet. Once you have a usable dough ball, roll it out as needed.