Sourdough biscuits

1 cup sifted flour
2 tsp baking soda
1/2 tsp salt
1/4 cup shortening
1 cup starter
1/4 tsp soda

Mix dry ingredients together.  Put in shortening.  Add starter and blend well.  Knead lightly for rolled biscuits or drop in muffin tins.  Roll 1/2 in thick.  Put in pans and raise, covered, about an hour.  Bake at 425 for about 20 mins