In a large zip-top bag, mix together the soy sauce, brown sugar, apples, pears, onion, water, garlic, rice wine vinegar, salt, pepper, chili pepper flakes, ginger powder and sesame oil. Add the short ribs and marinate overnight.
Preheat the grill to high. Grill the ribs for 5-7 minutes per side over direct heat.
Serve with white rice and a sprinkle of sliced green onions and sesame seeds.