- Heat oil in a skillet or pan over medium heat. Add in sliced pork belly and sear until lightly browned and its fats begin to render (juices oozing out). Put in onions and garlic and cook until fragrant and translucent.
- Pour in vinegar and leave to boil without lid. Then, mix in soy sauce and water. Put on the lid and simmer until pork is tender and sauce has reduced slightly, about 10–15 mins.
- Add long beans and mix well, cooking for 5 mins. Add salt and pepper to taste.
- Transfer to a serving bowl and serve hot over steamed rice.