01 - In a mixing bowl, whisk together gochujang, soy sauce, brown sugar, sesame oil, minced garlic, grated 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 gently to ensure every surface is thoroughly coated. Seal and refrigerate for at least 4 hours, preferably overnight for deeper flavor penetration.
03 - Preheat the oven to 320°F. Remove the ribs from the marinade, reserving all excess liquid. Arrange the ribs on a wire rack set over a rimmed baking sheet and cover tightly with aluminum foil. Roast for 1 hour until the meat begins to tenderize.
04 - While the ribs roast, combine the reserved marinade and honey in a small saucepan. Simmer over low heat for 5 minutes, stirring occasionally, until the mixture thickens into a glossy glaze.
05 - Increase the oven temperature to 400°F. Uncover the ribs and brush generously on all sides with the prepared glaze. Return to the oven uncovered and roast for 10 to 15 minutes until the exterior is deeply caramelized with slight charring at the edges.
06 - Remove the ribs from the oven and let them rest for 5 minutes to allow the juices to redistribute. Squeeze yuzu juice generously over the surface of the ribs while still warm.
07 - Scatter sliced scallions, toasted sesame seeds, and sliced red chili over the ribs. Cut between the bones into individual portions and serve immediately alongside steamed rice or pickled vegetables.