Preheat your oven and skillet: Preheat the oven to 450°F (230°C). Place a cast iron skillet in the oven. Alternatively, you can grease a baking sheet.
Combine flour and butter: In a large mixing bowl, combine the self-rising flour and grated butter. Use a pastry cutter or fork to work the grated butter into the flour until it resembles coarse crumbs.
Add buttermilk: Create a well in the center of the flour mixture. Slowly pour the cold buttermilk into the well, gently working it into the flour mixture with your hand or spatula until the dough just comes together. Be careful not to overmix; lumps are okay.
Form dough: Turn the dough out onto a lightly floured surface. Gently fold it over itself about 12 times, using a light touch to avoid overworking the dough.
Shape biscuits: Flatten the dough to about a 1-inch thickness. Use a biscuit cutter or mason jar to cut out biscuits, pressing straight down without twisting to avoid sealing the edges. This ensures the biscuits rise properly during baking.
Prepare skillet or baking sheet: If using a cast iron skillet, carefully remove it from the oven and add a small amount of butter to coat the bottom. If using a baking sheet, place the biscuits on the prepared sheet.
Bake: Arrange the biscuits in the skillet or on the baking sheet. Bake in the preheated oven for 12-15 minutes, or until the biscuits are golden brown on top and cooked through.
Enjoy: Brush the tops of the biscuits with melted butter before serving.