01 - In a mixing bowl, whisk together gochujang, soy sauce, brown sugar, sesame oil, garlic, ginger, rice vinegar, mirin, and black pepper until a smooth, uniform paste forms.
02 - Place the trimmed lamb ribs in a large resealable bag or shallow dish. Pour the marinade over the ribs, massaging the bag or turning the ribs to ensure every surface is thoroughly coated. Seal and refrigerate for at least 4 hours, preferably overnight for maximum flavor penetration.
03 - Preheat the oven to 320°F. Remove the ribs from the marinade, reserving all excess marinade in a separate container. Arrange the ribs on a wire rack set over a rimmed baking sheet and cover tightly with aluminum foil.
04 - Roast the covered ribs for 1 hour. Meanwhile, pour the reserved marinade into a small saucepan, stir in the honey, and simmer over low heat for about 5 minutes until the mixture thickens into a glossy glaze.
05 - Increase the oven temperature to 400°F. Uncover the ribs and brush them generously on all sides with the prepared glaze. Continue roasting uncovered for 10 to 15 minutes until the exterior is deeply caramelized and lightly charred in spots.
06 - Remove the ribs from the oven and allow them to rest for 5 minutes. Squeeze fresh yuzu juice generously over the surface of the ribs.
07 - Scatter sliced scallions, toasted sesame seeds, and sliced red chili over the ribs. Cut between the bones into individual ribs and serve immediately with steamed rice or pickled vegetables.