After 3 hours, pull the roast from the oven. Remove the foil and transfer the meat to a plate. Pour the liquid from the roasting tray through a sieve into a small pot. Return the meat to the tray and put it back into the oven, uncovered. Turn the heat up to 400F. Roast an additional 1 hour or until the pork reaches an internal temperature of 160 F and the skin is a dark, crispy shell. Remove the roast from the oven and let rest, uncovered, for 20 minutes.