food processor with shredding blade (or a box grater)
pastry cutter and biscuit cutter
Ingredients
1(18 gram) packet Red Star Platinum Instant Sourdough Yeast
1/4cupwarm water(115F)
5-1/4cupsall-purpose flour
1/4cupgranulated sugar
1-1/2teaspoonssalt
2teaspoonsbaking powder
1teaspoonbaking soda
1/2cupvegetable shortening(Crisco)
3/4cupfrozen grated unsalted butter
1-2/3cup(full fat) buttermilk
2tablespoonsmelted butter
Instructions
Mix contents of sourdough yeast with 1/4 cup warm water. in a large mixing bowl.
Stir in the flour, sugar, salt, baking powder and baking soda.
Use a pastry blender or forks to mix shortening into the flour mix until crumbly.
Shred frozen butter using a shredder disk on a food processor or a box grater.
Gently mix in the frozen butter shreds trying to handle with your hands as little as possible.
When dough comes together, pat it out on a lightly floured surface, patting with your hands rather than rolling.
Grease a 12-inch cast iron skillet or other suitable baking pan with shortening.
Cut out biscuits with a cutter and fit into the prepared pan.
Place in a proofer at 100F (I use the proof setting on my toaster oven) or place in another warm draft free place and allow to rise for about 30-40 minutes.
While dough proofs, preheat over to 400F.
Brush tops of proofed biscuits with melted butter; bake 30 minutes or until lightly browned.
Brush with any remaining melted butter and place until the broiler for a couple of minutes to crisp up the top.