Place pork belly and onions in a stockpot, add water to cover and bring to a boil over high heat. Lower heat to medium and simmer for about 45 minutes or until pork is just tender (not too soft or it won’t be crispy when fried). Drain pork and pat dry with paper towels.
Heat the oil over high heat in a large wok or frying pan until very hot. Carefully put the p