Wash and prepare the bean sprouts, green onion, and onion.
Cut the pork into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the pork.
Once the pork is cooked, add the onion, green onion, and bean sprouts.
Add gochujang, soy sauce, sugar, minced garlic, and pepper, then stir-fry.
When all the ingredients are cooked through, serve in a dish.