Ume suishō

Ume suishō is a Japanese delicacy commonly served as a sakana (drinking snack). It is prepared by finely chopping shark cartilage and dressing it with pickled plum paste, resulting in a distinctive crunchy texture and sour flavor. The dish is popular as an accompaniment to sake and shōchū, and is frequently served in small portions at izakaya (Japanese-style pubs). It is often garnished with ingredients such as shiso leaves or cucumber, and is sometimes used as a filling for hosomaki or other forms of sushi.

Description: Wikipedia — Ume suishō, CC BY-SA 4.0