The fish cake slice with a pink spiral pattern often found in ramen is narutomaki.
Narutomaki is a type of kamaboko, a Japanese cured fish product made from ground fish, or surimi. Its distinctive spiral is designed to resemble the whirlpools of the Naruto Strait, between Awaji Island and Tokushima on Shikoku. The slices are usually white with a pink or red center spiral and a cloud-like outline.
Narutomaki became a familiar ramen topping during the 20th century, although it is also used with udon and in dishes such as oden and nimono. A common mix-up is calling every Japanese fish cake narutomaki: kamaboko is the broader category, while narutomaki is the spiral-patterned variety. Other fish cakes, including chikuwa and satsuma-age, have different shapes and preparation methods.
The traditional spiral is made by layering pink surimi over white surimi, rolling the layers together, and steaming the roll before slicing it. The topping even has its own emoji: 🍥.