Sumibiya Nōkō Chūkasoba Shifudō is a ramen shop in Tokyo that serves mackerel ramen. The broth is made by grinding grilled mackerel into a soft stock and adding a smoky aroma. Small pieces of mackerel flesh remain in the broth, but there is no fishy taste. It is a different type of ramen from tonkotsu, shoyu, shio, and miso.