(Important note: You may substitute 2 1/2 cups buttermilk for the milk/vinegar mixture.)(Important note #2: If you use salted butter instead of shortening/lard, decrease the amount of salt you add.)Preheat the oven to 475 F.In a measuring pitcher, combine milk and vinegar. Stir together and set aside for 10 minutes. Note: You can use 2 1/2 cups buttermilk instead of the milk and vinegar if you have some on hand.In a large bowl sift together the flour and salt. Use a pastry cutter to cut in the lard (or butter or shortening or both) until the mixture resembles coarse crumbs. Pour the wet ingredients into the dry ingredients, stirring gently with a fork or wooden spoon until it all comes together. Flour the surface, then turn out the dough and knead 10-15 times, adding a little flour so it's less sticky. Roll out dough to 1/3 to 1/2 inch thick and use a biscuit cutter to cut medium to small circles. Place on a baking sheet 1/2 inch apart and bake for approximately 10 minutes, or until golden brown on top. Remove from oven and immediately brush on melted butter. To die for!***Baking time will vary depending on the size of the biscuit cutter you use. I made mini biscuits, which took about 9 to 10 minutes. Larger biscuits will take longer, so keep an eye on them as they bake.