Pat the pork belly dry and use a sharp knife to score the skin in a crosshatch pattern.
In a mixing bowl, combine five-spice powder, soy sauce, Shaoxing wine, sugar, salt, and white pepper. Rub the mixture over the meat side of the pork, avoiding the skin.
Let the pork belly marinate uncovered in the refrigerator for at least 2 hours, preferably overnight, to allow the skin to dry out.
Preheat the oven to 325°F (163°C). Place the pork belly skin-side up on a roasting rack and roast for 90 minutes.
Increase the oven temperature to 450°F (232°C) and roast for an additional 20–30 minutes, or until the skin is blistered and crispy.
Let the pork belly rest for 10 minutes before slicing. Serve with rice, pickled vegetables, or steamed buns.