01 - In a large bowl, whisk together soy sauce, gochujang, sesame oil, honey, garlic, ginger, rice vinegar, brown sugar, black pepper, and chopped spring onions until smooth and well combined.
02 - Place lamb ribs in a large resealable bag or shallow dish. Pour the marinade over the ribs, ensuring full and even coating. Seal and refrigerate for at least 1 hour, ideally overnight for deeper flavor penetration.
03 - Preheat oven to 320°F. Line a baking sheet with aluminum foil and set a wire rack on top. Arrange the marinated ribs on the rack in a single layer, reserving any leftover marinade for basting.
04 - Roast the ribs for 1 hour, basting with reserved marinade halfway through the cooking time to build layers of flavor and keep the meat moist.
05 - Preheat a grill or broiler to high heat. Transfer the roasted ribs to the grill and cook for 3-5 minutes per side until deeply caramelized and slightly charred at the edges.
06 - Remove ribs from heat and immediately squeeze fresh yuzu juice over the top. Garnish with toasted sesame seeds, sliced spring onions, and red chili if desired. Serve hot with additional yuzu wedges alongside.