01 - In a large bowl, combine soy sauce, gochujang, sesame oil, honey, minced garlic, grated ginger, rice vinegar, brown sugar, black pepper, and chopped spring onions. Whisk until smooth and well blended.
02 - Place the lamb ribs in a large resealable bag or shallow dish. Pour the marinade over the ribs, ensuring they are fully coated on all sides. Seal tightly and refrigerate for at least 1 hour, ideally overnight for maximum flavor penetration.
03 - Preheat oven to 320°F. Line a baking sheet with aluminum foil and place 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 in the preheated oven for 1 hour, basting generously with the reserved marinade halfway through the cooking time to build layers of flavor.
05 - Preheat a grill or broiler to high heat. Transfer the roasted ribs to the grill and cook for 3 to 5 minutes per side until the exterior is deeply caramelized and lightly charred in spots.
06 - Remove the ribs from heat and immediately squeeze fresh yuzu juice over the top. Garnish with toasted sesame seeds, thinly sliced spring onions, and red chili if desired. Serve hot with extra yuzu wedges alongside.