To make the crust:
Mix together dry ingredients in a large bowl. Cut the butter into small pieces and add to bowl. Using a pastry blender or two knives, cut the butter into the flour until the mixture resembles coarse crumbs and a few pea-sized pieces remain. Drizzle with ice water and stir. If you can't form a ball with your hands, add 1-2 Tbs. more ice water. Divide the dough in half, press each half into a round flat disk, wrap tightly in plastic or wax paper, and refrigerate.