Sift the flour and salt together into a bowl Add the lard and cut together with a pastry cutter. Use a fork to stir in the buttermilk gently. Gently knead the dough a few times, adding more flour if you need to.
Roll out the dough and cut out biscuits with a small round cutter. Place on baking sheets and bake for 10 minutes. Brush with butter when you remove them from the oven.