Season the short ribs with salt and pepper.
Heat the oil in a large Dutch oven or oven-safe pot with a lid over medium-high heat.
Sear the short ribs, working in batches to avoiding overcrowding the pan, until browned on each side. Remove and set aside.
Add the onion to the pot and cook until softened, about 5 minutes, stirring occasionally. Add the garlic and cook for about 30 seconds more.
Return the short ribs to the pot. Pour in the beef broth and add the bay leaf.
Bring the mixture to a simmer. Cover the pot and transfer to a preheated oven at 325°F.
Braise for 1½ -2 hours, or until the short ribs are fork-tender.
Meanwhile, whisk together soy sauce, brown sugar, sesame oil, gochujang, and ginger in a small bowl until the sugar dissolves.
Transfer the short ribs to a baking sheet; remove and discard the bones. Shred the meat with two forks.
Pour the Korean BBQ Taco Sauce over the shredded short ribs and toss to coat evenly.
Broil the short ribs on high for 2-3 minutes, or until lightly caramelized, watching closely to prevent burning.