Put all the dry ingredients in a large bowl. Cut in shortening, lard or butter with a pastry blender until you have pea-sized bits. Now add in starter using a fork, putting in about 1½ cups first. If the dough is still too stiff or dry, add enough until a soft dough forms. Once dough is formed, pat it out or use a rolling pin on a floured board. Cut out biscuits using a 2 inch cutter, and place 1 inch apart on a greased cookie sheet or pat dough into a square or rectangle, and using a knife, cut out square biscuits.

Bake biscuits in a 425-degrees Fahrenheit conventional oven, 400 degrees for a convection oven, for about 12 minutes. Always keep an eye on them, and they should be nicely browned when done. Remove from oven and let cool on a wire rack. Serve with butter; best while hot.