Cut the thinly sliced pork belly, onion, and green onion into bite-sized pieces.
Put the pork belly in a pan and stir-fry over medium heat until the fat comes out.
Add the onion and green onion, and stir-fry together.
Add soy sauce, sugar, minced garlic, and pepper. Stir-fry to evenly season everything.
Place the stir-fried ingredients over rice and sprinkle sesame oil and toasted sesame seeds on top.