What is 'narutomaki' and what is it made of?

Narutomaki is a type of Japanese fish cake that is often used as a topping for ramen. It's made from a paste of white fish (surimi) that is steamed in a log shape. The most distinctive feature of narutomaki is the pink spiral pattern in the center, which is meant to resemble the Naruto whirlpools in the Naruto Strait in Japan. Narutomaki has a mild, slightly sweet flavor and a firm, chewy texture.