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, homogeneous 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 tightly and refrigerate for at least 4 hours, or ideally overnight for maximum flavor penetration.
03 - Preheat oven to 320°F. Remove 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.
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 5 minutes until reduced to a glossy glaze.
05 - Increase oven temperature to 400°F. Uncover the ribs and brush generously on all sides with the honey-glaze mixture. Return to the oven uncovered and roast for 10 to 15 minutes until deeply caramelized and lightly charred at the edges.
06 - Remove ribs from the oven and let rest for 5 minutes. Squeeze yuzu juice generously over the ribs, allowing the bright citrus to mingle with the caramelized glaze.
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.