Heat the oven to 425F/220C.
Place the pork on a rack in a roasting pan and cook for 20 minutes. Turn the pork and cook for an additional 20 minutes. Reduce the heat to 350F/180C, and cook for an additional 20 minutes, until the pork reaches an internal temperature of 170F/75C.
Remove from the oven. When the pork is cool enough to handle, cut across the grain into ¼-inch (5mm) thick pieces. Serve at room temperature or cold. Brush any remaining cooking sauce over the sliced pork before serving.