Cut the pork, onion, and green onion into bite-sized pieces.
In a bowl, mix together gochujang, chili powder, soy sauce, sugar, minced garlic, and other seasonings.
Marinate the pork in the sauce for 10 minutes.
Heat cooking oil in a pan and sauté the onion and green onion.
Add the marinated pork and stir-fry together.
When the meat is cooked, finish with a drizzle of sesame oil.