Cut the thinly sliced pork belly and vegetables into bite-sized pieces.
Add cooking oil to a pan and stir-fry the pork belly.
When the pork is halfway cooked, add onion, green onion, and mushrooms, then stir-fry together.
Season with soy sauce, minced garlic, chili powder, and pepper.
Pour in 100ml of water, cover with a lid, and simmer on low heat for 10 minutes.
Place the finished steamed pork belly on a plate and serve.