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 incorporated.
02 - Place the lamb ribs in a large resealable bag or shallow dish. Pour the marinade over the ribs, ensuring every surface is thoroughly coated. Seal and refrigerate for at least 1 hour, preferably overnight for deeper flavor penetration.
03 - Preheat 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 cooking to build a rich, sticky glaze.
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 caramelized, slightly charred, and deeply lacquered.
06 - Remove ribs from heat and immediately squeeze fresh yuzu juice over the top. Sprinkle with toasted sesame seeds, thinly sliced spring onions, and optional red chili slices.
07 - Serve hot with extra yuzu wedges on the side for additional citrus brightness.