Cut the pork and kimchi into bite-sized pieces.
Heat some cooking oil in a pan and stir-fry the pork.
When the pork is about halfway cooked, add the kimchi and stir-fry together.
Add gochujang (Korean chili paste), soy sauce, minced garlic, and chili powder for seasoning.
Add onion and green onion, and stir-fry further.
Once all ingredients are cooked through, finish with sesame oil and black pepper.