Cut the pork leg into bite-size pieces.
Thinly slice the onion, green onion, and garlic.
Mix gochujang (Korean chili paste), red pepper flakes, soy sauce, sugar, minced garlic, ginger, and sesame oil to make the sauce.
Add the sauce to the pork and mix well, then marinate for 20 minutes.
Heat cooking oil in a pan, then sauté green onion and garlic to bring out the aroma.
Add the marinated pork and stir-fry.
Add vegetables such as onion and carrot, and stir-fry together over high heat.
Once the meat is cooked, turn off the heat and sprinkle with sesame seeds.