Preheat your oven to 400.
Begin by preparing a baking sheet with parchment paper.
Combine the flour, baking powder, soda, sugar and salt in a large bowl. Blend the dry ingredients in a large bowl. Add the lard and butter and work them in using a pastry cutter, fork or your hands.
Pour in the buttermilk and mix the dough until most of the flour is absorbed.
Turn the dough out onto the prepared baking sheet and press out into rectangle shape about ¾ of an inch thick. Fold over itself length wise and press back out to ¾ of an inch again. Repeat this process 4-6 times or until the dough come together. You should have a stiff dough that is not sticky.
Form the dough into a rectangle that is about 1 to 1 ½ inches thick. Cut into six squares with a pizza cutter or sharp knife.
Let the biscuits rise at room temperature until doubled in size, about an hour. Brush the tops of the biscuits with melted butter for a golden-brown top. Preheat the oven to 400 degrees and bake the biscuits in the oven for 15 to 20 minutes.