Cut the pork, onion, Fuji apple, and green onion into bite-sized pieces.
Prepare the marinade by mixing gochujang (Korean chili paste), soy sauce, minced garlic, sugar, red pepper powder, black pepper, and cooking wine.
Mix the pork with the marinade and the Fuji apple thoroughly.
Heat oil in a pan and sauté the green onion to infuse the flavor.
Add the marinated pork and onions to the pan and stir-fry over high heat.
Once the meat is cooked and the onion becomes translucent, turn off the heat and mix in sesame oil.
Transfer to a plate and sprinkle with sesame seeds to finish.