Cut the thin pork belly and vegetables into bite-sized pieces.
Add oil to a pan and stir-fry the pork belly.
Once the meat is cooked, add onion, green onion, and chili pepper, and stir-fry together.
Add the stir-fry sauce and mix well while stir-frying.
When the sauce is evenly absorbed and it's cooked through, transfer to a plate.