Cut the pork into bite-sized pieces.
Julienne the onion, green onion, and carrot.
In a bowl, mix gochujang (Korean chili paste), soy sauce, sugar, minced garlic, gochugaru (chili flakes), and sesame oil to make the seasoning sauce.
Add the sauce to the pork, mix well, and marinate for 10 minutes.
Add oil to a pan, stir-fry the green onions to release their aroma.
Add the pork and vegetables to the pan and stir-fry over high heat.
Once everything is cooked through, add sesame oil and stir-fry briefly to finish.