01 - In a mixing bowl, whisk together gochujang, soy sauce, brown sugar, sesame oil, minced garlic, grated ginger, rice vinegar, mirin (if using), 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 to ensure every surface is thoroughly coated. Seal and refrigerate for at least 4 hours, or preferably overnight for deeper 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. Tent tightly with aluminum foil.
04 - Roast the covered ribs in the oven for 1 hour. Meanwhile, pour the reserved marinade into a small saucepan, stir in the honey, and simmer over low heat for 5 minutes until the mixture reduces into a glossy glaze.
05 - Increase the oven temperature to 400°F. Remove the foil from the ribs and brush them generously on all sides with the honey-gočhujang glaze. Return to the oven uncovered and roast for 10–15 minutes until the surface is deeply caramelized and lightly charred in spots.
06 - Remove the ribs from the oven and let them rest for 5 minutes. Squeeze fresh yuzu juice generously over the surface of the ribs to add a bright, fragrant citrus note.
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.