Cut pork, onion, and green onion into bite-sized pieces.
Chop the kimchi into bite-sized pieces as well.
Heat some cooking oil in a pan and stir-fry the pork.
When the pork is about half cooked, add the kimchi, onion, and green onion.
Add gochujang (Korean chili paste), soy sauce, sugar, and minced garlic, then stir-fry everything together.
When all ingredients are cooked, finish with sesame oil and black pepper.