1. In a mixing bowl, combine soy sauce, brown sugar, water, mirin, sesame oil, grated Asian pear, minced garlic, minced ginger, and chopped green onions.
2. Add the beef short ribs to the marinade, ensuring they are well coated. Marinate for at least 4 hours or overnight in the refrigerator.
3. Preheat the grill to medium-high heat.
4. Grill the marinated short ribs for about 3-4 minutes on each side, until they are nicely charred and cooked through.
5. Sprinkle toasted sesame seeds over the grilled ribs before serving.
Notes:
Serve with steamed rice and kimchi for a complete meal.