Spectacular crispy skin roast pork with crackling, bubbly skin is a Cantonese treasure. A high protein, family celebration dish with fresh, rich flavor.
Pat the pork belly skin thoroughly dry with paper towels to remove surface moisture.
Flip pork, pierce skin all over with a fork (avoid puncturing the meat), then rub flesh side with 1 tbsp kosher salt, five-spice powder, and white pepper evenly.
Turn pork skin-side up, brush skin with rice vinegar, then coat the skin with the remaining 1 tbsp salt to form a crust.
Rest the pork uncovered in the refrigerator for at least 8 hours, allowing the skin to dry completely.
Preheat oven to 350°F (175°C). Place pork on a rack over a roasting pan and bake for 1.5 hours; then raise oven to 450°F (230°C) and roast for 30–40 minutes until skin blisters and puffs—watch carefully to avoid burning.
Let the pork rest 15 minutes before slicing to preserve juiciness; use a sharp knife to cut through the crispy crackling cleanly.