Cut the pork into bite-sized pieces.
Julienne the onion, green onion, and carrot.
Mix gochujang, soy sauce, sugar, minced garlic, and Korean chili powder to make the marinade.
Add the marinade to the pork and let it marinate for 10 minutes.
Heat oil in a pan and stir-fry the green onion until fragrant.
Add the marinated pork and vegetables, then stir-fry over high heat.
Once the pork is cooked through, turn off the heat and finish with a drizzle of sesame oil.