Narutomaki or naruto is a traditional type of fish cake and a type of kamaboko (cured fish surimi) that’s most commonly used as ramen topping. It’s made by wrapping white fish paste (surimi) that’s been colored with red food dye around undyed fish paste.
The combination is rolled into a log, steamed until solid, then cut into thin slices. On the cross-section, there is a spiral after which it was named because it’s reminiscent of the famous Naruto whirlpools which appear between Shikoku and Awaji Island.