Place pork belly into a pot with cold water and bring to a simmer.
Simmer pork for several minutes, then drain and allow to cool on a rack.
When cool enough to handle, pierce the skin of the pork belly all over with a fork or a knife.
Rub the pork belly all over with salt, white pepper and five spice powder. Brush the skin with vinegar.
Refrigerate the pork belly overnight, uncovered, on a rack.
To cook, preheat the oven to 180C/350F. Roast the pork uncovered for 1-2 hours until the skin is puffed up. In the meantime, make rice and vegetables.
Cut the roasted pork belly into bite sized pieces. Serve hot.