Fred's Buttermilk Biscuits

4 cups sifted flour
4 tsp baking powder
1  1/2 tsp salt
2/3 cup shortening
1  1/2 cups buttermilk

Mix only as much as needed or biscuits will be tough.
On floured board, roll 1/2 inch thick.
Bake in a 400° oven for 15 minutes.
Makes about 15 biscuits.