01 - In a mixing bowl, whisk together the 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 to ensure every surface is thoroughly coated. Seal and refrigerate for at least 4 hours, or preferably overnight for maximum flavor penetration.
03 - Preheat the oven to 320°F. Remove the ribs from the marinade, reserving any excess. Set the ribs on a wire rack placed over a rimmed baking sheet and cover tightly with aluminum foil.
04 - Roast the covered ribs for 1 hour. While roasting, combine the reserved marinade with the honey in a small saucepan and simmer over low heat for about 5 minutes until reduced to a glossy glaze.
05 - Increase the oven temperature to 400°F. Uncover the ribs and brush generously on all sides with the honey glaze. Continue roasting uncovered for 10 to 15 minutes until the surface is deeply caramelized and lightly charred in spots.
06 - Remove the ribs from the oven and let rest for 5 minutes. Squeeze the yuzu juice liberally over the hot ribs to brighten the flavors.
07 - Scatter the sliced scallions, toasted sesame seeds, and sliced red chili over the ribs. Cut between the bones and serve immediately.