What is 'niboshi' ramen?

Niboshi ramen is a style of ramen that is made with a broth that is flavored with 'niboshi,' or dried baby sardines. The niboshi are simmered in water to create a dashi that is rich in umami and has a distinctively fishy flavor. Niboshi ramen can be either a clear 'assari' style or a rich and cloudy 'kotteri' style. It's a popular style of ramen for those who enjoy a strong and assertive fish flavor.