Cut the pork into bite-sized pieces.
Prepare the vegetables such as onion, green onion, and chili peppers.
In a bowl, mix together gochujang (Korean red chili paste), gochugaru (chili flakes), soy sauce, minced garlic, and other seasonings.
Add the seasoning mixture to the pork and marinate for 10 minutes.
Heat oil in a pan and stir-fry the marinated pork.
Add the vegetables and stir-fry together until cooked.