Cut pork into bite-sized pieces.
Slice onion, green onion, and carrot into thin strips.
Make the sauce with gochujang (Korean chili paste), chili powder, soy sauce, minced garlic, sugar, and sesame oil.
Add the sauce to the pork and marinate for 10 minutes.
Heat cooking oil in a pan and stir-fry green onion until fragrant.
Add pork and vegetables to the pan and stir-fry over high heat.
When the pork is cooked, turn off the heat and finish with sesame oil and sprinkle sesame seeds.