In a large bowl, combine the beef, soy sauce, rice wine, brown sugar, sesame oil, garlic, ginger, black pepper, and red pepper flakes (if using). Marinate the beef for at least 15 minutes.
Heat a large skillet or grill pan over medium-high heat. Add the beef to the pan and cook for 2-3 minutes per side, or until the beef is cooked through.
Add the green onions and chopped onion (if using) and cook for 1 minute. Serve the bulgogi with steamed rice, lettuce leaves, and other sides.
Interesting Facts
Bulgogi is one of the most popular Korean dishes and is often served at special occasions.
Bulgogi can also be cooked in a slow cooker for a more tender and juicy result.
The word “bulgogi” means “fire meat” in Korean, referring to the traditional method of cooking the meat over an open flame.