Cut the pork into bite-sized pieces.
Slice the onion, green onion, and spicy green chili.
Make the sauce by mixing gochujang (Korean chili paste), soy sauce, sugar, minced garlic, and red pepper powder.
Mix the pork with the sauce to marinate.
Heat cooking oil in a pan and stir-fry the pork.
Add the vegetables and stir-fry together.
When the pork is cooked, finish by drizzling with sesame oil.