Clean and prepare the short ribs thoroughly.
Mix soy sauce, sugar, minced garlic, minced ginger, sesame oil, pepper, pear juice, onion juice, and mirin to make the marinade.
Evenly coat the short ribs with the marinade and let them marinate for at least 2 hours.
Heat oil in a pan and grill the marinated short ribs until golden brown.
Serve the grilled short ribs on a plate.