Pour into unbaked 9-inch pie crust. Cool on rack. Cut inshortening with pastry blender until mixture resembles coarse meal. Dissolve soda in buttermilk, pour evenly over flour mixture, stirring until dry ingredients are moistened. Turn dough out onto floured surface, knead 10-12 times.
Place biscuits on greased baking sheet.
Bake in preheated 450 degree oven for 10 minutes, or until lightly browned. Try these with some good old country sugar cured ham. Salt to taste. Serve with corned bread or hushpuppies, and a side of coleslaw. Very tasty, and no fat unless you add the ham or shrimp.