To make biscuit:
Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper.
the flour, sugar, baking powder, salt, and baking soda
in a large mixing bowl.
Using a food processor, pastry cutter, or your fingertips incorporate 3/4 cup chilled butter into the dry ingredients until the mixture resembles coarse meal.
Add the buttermilk and stir just until moistened. Using 1/2 cup dough for each biscuit, drop the biscuits onto the prepared baking sheet, spacing mounds about 2-inches apart.
Bake the biscuits
until they are golden brown on top, about 15 to 20 minutes or until a tester comes out clean. Serve the biscuits warm.
Seasoning Your Cast Iron Skillet
Position a rack in the center of the oven, and preheat the oven to 325 degrees F.
Wash the skillet with warm, soapy water and dry thoroughly.
Apply a thin coating of vegetable oil
or vegetable shortening
with a paper towel on all surfaces, inside and out.
Place the skillet on the oven rack, upside down. Place a baking sheet or a sheet of foil on the rack beneath to catch any dripping.
Bake for 1 hour, then turn off the heat, open the door, and allow the skillet to cool inside the oven before removing. The skillet is now ready to use.
To wash: Scrub the skillet with hot water and a brush without detergent. Never use sharp or metal utensils on it while cooking and never place in the dishwasher.