Rinse the pork belly, cut it into large chunks, and place them in a large pot.
2 kg pork belly
Add enough water to fully cover the pork.
Add the salt, peppercorns, garlic, and bay leaf. Cover and bring to a boil, then reduce the heat and simmer for 30 to 45 minutes, or until the meat is tender. Skim off any scum as needed.
2 tablespoons salt, 1 teaspoon peppercorns, 0.5 head garlic, 1 leaf bay leaf
Lift out the pork and transfer it to a colander. Let it drain for a few minutes.
Prick the skin all over with a fork, then pat it very dry with paper towels.
Refrigerate the pork for several hours (ideally 4 hours) to dry the skin thoroughly.
Double-frying
Heat enough cooking oil in a large pot or deep fryer. Fry the pork over low heat for 30 to 45 minutes, or until lightly browned.
cooking oil
Remove and drain in a colander or on paper towels. Let cool completely.
Heat the same oil over medium heat, then fry the pork a second time for 10 to 15 minutes, until the skin is deep golden, blistered, and shatteringly crisp.
Drain on paper towels, cut into serving pieces, and serve right away.
Notes
For the crispiest results, make sure the boiled pork is completely dry: pat it thoroughly with paper towels before frying.
The oil should be very hot when you add the pork. Use long tongs to reduce splatter.
Keep a lid nearby and cover immediately if the oil starts to spit aggressively.