Finely mince the pork leg.
Chop the onion and green onion.
Heat cooking oil in a pan and stir-fry the minced pork, onion, and green onion.
When the meat is cooked, add gochujang (red chili paste), sugar, soy sauce, and minced garlic, and stir-fry.
Continue stirring over medium heat until all ingredients are well mixed and cooked through.
Sprinkle with sesame seeds to finish.