Prepare the Beef: Slice the beef thinly against the grain for tenderness.
Make the Marinade: In a bowl, mix soy sauce, garlic, ginger, sesame oil, and brown sugar.
Marinate the Beef: Add beef slices, coat evenly, and let marinate for 15β30 minutes.
Preheat the Pan: Heat a skillet or grill pan over medium-high heat.
Cook the Beef: Sear beef slices 1β2 minutes per side until caramelized but still juicy. Avoid overcrowding.
Optional Glaze: Reduce leftover marinade in a small saucepan until thickened; toss cooked beef in it.
Serve: Arrange beef dippers on a platter, garnish with sesame seeds and green onions, and serve with dipping sauces or vegetables.