They're called "cathead" biscuits because they should be about the size of a cat's head. They should be somewhat round on top and not flat like canned biscuits. Do not cut them out of rolled-out dough with the rim of a glass or with any other implement, as every biscuit recipe I've ever read said to do. Roll them into a ball with your hands and bake them in a cast-iron skillet.
1 1/8 cup self-rising flour
2/3 cup milk or buttermilk
1/8 cup oil or bacon drippings
Recipe
Step #1: Blend above ingredients in a mixing bowl.
Step #2: Dump a hand full of flour on a pastry cloth or whatever. A brown paper sack also works. Newspaper also works just fine.
Step #3: Dump the blended dough onto the flour.
Step #4: Pour a dash of oil into your skillet and smear it around with your fingers. Coat the inside of the skillet and the palms of your hands with oil.
Step #5: Knead the dough for about 30 seconds, rolling it in the flour and thickening it.
Step #6: Halve the dough. Halve it again, making 4 pieces of dough.
Step #7: Roll each piece of dough between your hands, making it into a ball, then put it in the skillet.
Step #8: Use a spoon or a pastry brush and put a little oil or bacon drippings on the top of each unbaked biscuit.
Preheat oven to 350°. Bake 25 minutes. Broil/toast for 1 or 2 minutes.