(Optional) Heat a drizzle of oil in a large pan over medium heat. Add onion and cook, stirring, until softened, 4-5 minutes.
Mix Soy Sauce, Brown Sugar, Seasame Oil, Siracha, Minced Garlic, Hoisin Sauce in a bowl…this will be the marinade for the short ribs.
Pour mixture over the short ribs and thoroughly mix the mixture into the ribs. Let it marinate for 30 mins - 24 hours however long you want the ribs to sit in the mixture.
Pre-heat grill to medium high.
Put ribs on grill for 4-5 mins per side or until you get a caramelization on both sides!