Ramen Keisuke Tonkotsu King Four Seasons is a ramen shop in Clarke Quay, Singapore, serving four seasonal tonkotsu ramen. Diners choose among spring, summer, autumn, and winter, and specify broth richness, noodle doneness, oil amount, and toppings. Boiled eggs and bean sprouts are unlimited, and the autumn ramen includes mushrooms and meat. The broth is thick and the seasoning is strong, so even the less salty option is hard to finish.