Preheat oven to 450 degrees F. In a large bowl, combine flour, baking powder and salt. Add the small pieces of shortening. Cut together the ingredients using a pastry cutter or two fork until the mixture is pea size lumps.
Add milk and stir until is just comes together. Grease a cast iron skillet with additional shortening. Drop the biscuit mixture in about 1/4 cup mounds into the skillet, forming 8 biscuits. They should be rough looking.