Preheat the oven to 375°. In a bowl, sift the flour with the baking powder, sugar and salt. Using a pastry blender or 2 knives, cut in the shortening until the mixture resembles coarse meal. Stir in the milk until just moistened.
Turn the dough out onto a lightly floured work surface and knead twice. Roll out the dough 1/3 inch thick. Using a 2-inch biscuit cutter, stamp out biscuits as close together as possible; transfer to a baking sheet. Reroll the scraps and stamp out the remaining biscuits. Bake for about 20 minutes, or until lightly golden. Serve immediately.