Heat oven to 450ºF.
In a large mixing bowl, sift together dry ingredients. Working quickly so the fats don’t melt, use your fingertips to rub the lard and butter into the dry mixture until it resembles coarse crumbs.
Make a well in the center of the dry mixture and pour in the chilled buttermilk. Stir until dough just begins to come together — it will be very sticky. While it’s still in the bowl, fold the dough over on itself 2 times so that it picks up any remaining flour, and then turn it out onto a lightly floured work surface.
Dust the top of the dough with flour. With floured hands, gently fold the dough over itself 8 more times, turning one quarter turn between each folding motion. Press dough into a 1-inch-thick round. Cut out biscuits with a floured 2 1/2-inch cutter, being sure to press straight down through the dough without twisting. Flour the cutter between cuts.
Center biscuits on an ungreased baking sheet, shoulder to shoulder, so that they just touch. Reform scrap dough, working it as little as possible, and continue cutting.
Place biscuits in oven and bake 10 minutes. Rotate the pan 180 degrees in the oven and continue baking until fluffy and lightly golden on top, 10 to 12 minutes.
Remove the biscuits to a bowl lined with a clean tea or kitchen towel and fold towel over to preserve warmth and steam. Serve with butter and jam, or mustard and thin-cut ham, or sausage patties or just...eat them.