In a food processor or blender, add flour, baking soda and sugar. Process to distribute dry ingredients together well.

Add shortening and pulse until mixture is crumbly, like coarse cornmeal. Pour in buttermilk and yeast mixture.

Turn dough out onto a lightly floured board and knead together 2-3 times. Pat out or roll to a thickness of 1 inch.

Using a biscuit cutter, cut dough into 2 1/2 inch rounds and place on a baking sheet. Allow to rise for 30 minutes in a warm place.

Bake in a preheated 400°F degree oven 15-20 minutes or until golden brown.

Makes about 18.