Add pieces of butter and shortening and, using a pastry blender or fork, cut into the dry ingredients until the pieces are about the size of small peas and evenly distributed. If using a food processor, pulse about 15 times, until the mixture resembles coarse meal.
Stir in the buttermilk, mixing with a spatula until the dough comes together in a rough ball. Turn the dough out onto a lightly floured surface and knead gently and briefly, no longer than 30 seconds, until the dough appears uniform. With a rolling pin, roll out the dough to about 1 inch thick.
Dip a 21/2-inch biscuit cutter in flour, then press straight down through the dough, without twisting. Place the dough round upside-down on an ungreased baking sheet. Gather the scraps into another inch-thick piece and cut more rounds until all the dough is used.
Bake for 5 minutes, then reduce the heat to 400 degrees and bake for another 10 minutes, until golden brown. Serve immediately.
Nutrition information per serving:
Calories260Fat13 gSodium600 mg