Preheat oven to 425. Mix buttermilk and baking soda together and set aside. Grease biscuit pan or iron skillet very well.
Blend well together the flour, salt and sugar then make a hole in center of flour and put in the crisco. You can use the regular crisco or lard if you prefer.
Cut in the crisco with a fork and gradually add buttermilk and work small amounts of flour so you can knead. You may have to add a little more flour or buttermilk to get the right consistency. I don't normally have to do this.
Pinch off pieces with floured hands and roll until smooth, making note not to over work dough.
Place into well greased pan and bake at 425 for approximately 15-17 minutes or until golden brown. You can brush tops with butter if so desired.