Wash and prepare the bean sprouts for kongbul and beef thoroughly.
Heat cooking oil in a pan and sauté minced garlic.
Add beef and stir-fry, then add bean sprouts and onion and continue stir-frying.
Add the seasoning sauce (soy sauce, gochugaru, sugar, etc.) and mix well.
Add rice and stir-fry until all ingredients are well combined.
Finish with sesame oil and pepper, then serve on a plate.