Biscuits with Milk Gravy

Preheat the oven to 450 °. In a medium bowl, combine the flour, sugar, baking powder, baking soda and 1/2 teaspoon salt. Cut in the shortening with a fork until it looks like cornmeal. Add the milk, a little at a time, stirring constantly until well mixed. Turn the dough out onto a lightly floured surface. Knead lightly two or three times. Roll out the dough with a floured rolling pin to 1/2-inch thickness. Cut with a 2-inch cutter. Place the biscuits in a greased iron skillet. Gently press down top of biscuits. Brush the biscuits with half the 1/4 cup melted butter. Bake for 14 minutes or until golden brown. Brush the hot biscuits with the remaining 1/4 cup butter. Split the biscuits in half and ladle milk gravy over the hot biscuits.