Ramen YAMADAYA’s specialty is Tonkotsu broth ramen noodle. The rich flavored soup is cooked with pork bones after more than 20 hours of boiling. For the first 10 hours, the cauldron is boiled with the strong fire to break bones into flakes. Then, it is simmered for another 10 hours to extract the genuine pork bone broth. This process makes the soup rich and tasty. You will feel the deepness of our Tonkotsu broth after a sip of it.