Stir together first 4 ingredients in a large bowl.
Cut butter and shortening into flour mixture with a pastry blender until mixture resembles small peas. Push mixture to 1 side of bowl.
Drizzle 1 Tbsp. apple cider along edge of mixture in bowl. Using a fork, gently toss a small amount of flour mixture into cider just until dry ingredients are moistened; move mixture to other side of bowl. Repeat procedure with remaining cider and flour mixture.
Gently press dough into two flat disks. Wrap in plastic wrap, and chill 1 to 24 hours.
TIPS when ready to fill and bake: Place 1 Cornmeal Crust Dough disk on a lightly floured piece of wax paper; sprinkle dough lightly with flour. Top with another sheet of wax paper. Roll dough to about 1/8-inch thickness (about 11 inches wide).
Remove and discard top sheet of wax paper. Starting at 1 edge of dough, wrap dough around rolling pin, separating dough from bottom sheet of wax paper as you roll. Discard bottom sheet of wax paper. Place rolling pin over a 9-inch glass pie plate, and unroll dough over pie plate. Gently press dough into pie plate.
Roll remaining Cornmeal Crust Dough disk as directed in Step 5, rolling dough to about 1/8-inch thickness (13 inches wide). Remove and discard wax paper, and place dough over filling; fold edges under, sealing to bottom crust, and crimp.