01 - In a large bowl, whisk together the soy sauce, gochujang, sesame oil, honey, minced garlic, grated ginger, rice vinegar, brown sugar, black pepper, and chopped spring onions until fully incorporated.
02 - Place the lamb ribs in a large resealable bag or shallow dish. Pour the marinade over the ribs, massaging to ensure complete and even coating. Seal and refrigerate for at least 1 hour, ideally overnight for deeper flavor penetration.
03 - Preheat the oven to 320°F (160°C). 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 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 deeply caramelized and lightly charred at the edges.
06 - Remove the ribs from heat. Squeeze fresh yuzu juice generously over the top and garnish with toasted sesame seeds, sliced spring onions, and optional red chili. Serve immediately with extra yuzu wedges alongside.