Marinate the ground beef 4 to 8 hours: Combine all ingredients except vegetable oil in a bowl and mix together well. Allow the beef to marinate, covered in the refrigerator, for a minimum of 4 hours, ideally overnight.
Cook the beef, then serve: The next day, heat the vegetable oil in a large sauté pan over medium heat and cook the ground beef thoroughly, stirring occasionally to break up any large chunks. Serve the bulgogi hot, with lettuce or cabbage wraps and steamed rice.
