Cut the pork into bite-sized pieces.
Make the sauce by mixing soy sauce, sugar, minced garlic, gochujang (Korean chili paste), sesame oil, pepper, etc.
Add the sauce to the pork and marinate for at least 30 minutes.
Heat some cooking oil in a pan over medium heat and stir-fry the pork.
Add vegetables like onion and green onion, and continue stir-frying.
Once everything is cooked, sprinkle with sesame seeds to finish.