Combine 1/2 cup water, the soy sauce, sugar, ginger, peppercorns, garlic, bay leaves and some salt in a cast-iron or flame-proof casserole pot. Add the pork and let marinate for at least 1 hour. Make sure that all the meat is well covered with the marinade.
Preheat a barrel oven or regular oven to 350 degrees F.
Place the pot over high heat and bring to a boil. Boil for five minutes, and then stir in the vinegar.
Transfer to the oven and roast until the pork is tender, about 1 hour, stirring gently occasionally.
Serve hot with freshly steamed rice.
NotesCook's Note: Boiling the pork initially on the stove top without the vinegar makes the pork tenderize more quickly.
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