How to Make It
Combine first 4 ingredients in a bowl; cut in shortening and butter with a pastry blender or fingertips until mixture is about the size of small peas. Sprinkle buttermilk evenly over surface; stir with a fork just until dry ingredients are moistened. Cover and chill 1 hour, if desired. Roll pastry to 1/8-inch thickness on a lightly floured surface (about 12-inch diameter). Place in a 9-inch pie plate; fold edges under, and crimp.
Susan McEwen McIntosh, Glorious Grits – America's Favorite Comfort Food