Into a large bowl sift the flour and salt. Add the butter pieces and shortening and work them into the flour by hand until the dough starts to come together and form small pea shapes. Work the ice water into the dough 1 tablespoon at a time with your fingers until it just comes together, being careful not to over mix. Form the crust into a disk shape, wrap tightly in plastic wrap, and place in the refrigerator to rest for at least 30 minutes before rolling out.