Cut the thinly sliced pork belly and vegetables into bite-sized pieces.
Heat oil in a pan and stir-fry the pork belly.
When the meat is half-cooked, add onion, green onion, chili peppers, and stir-fry.
Add gochujang, soy sauce, sugar, and minced garlic, then stir-fry until the sauce is absorbed.
When all ingredients are cooked through, plate and serve.