Preheat the oven to 375 degrees F. In a large bowl
sift together the flour
, salt, baking powder, and baking soda. Using a pastry blender
or your hands, cut in the pieces of shortening until the mixture resembles coarse crumbs. Make a well in the center of the flour mixture and add 1 cup
buttermilk. Using your hands, quickly fold the dry ingredients into the buttermilk until a sticky dough forms. (If the dough is too dry, you can add 1/2 to 1 cup of additional buttermilk, a little at a time, until a sticky dough forms.) Turn the dough out onto a floured surface. Gently fold the dough three or four times to create layers. Press the dough out to a 1 1/2-inch thickness and cut with a floured 3-inch biscuit cutter. Lay the biscuits on an ungreased cookie sheet
and brush the tops with additional buttermilk. Bake for 20 to 25 minutes, until golden brown.