Bonito plum

Not vegan. If you see it, put it back.

Also spotted as

梅かつお / 梅おかかume katsuo, ume okaka

plum with bonito flakes

調味梅干しchomi umeboshi

seasoned pickled plum, often with bonito

はちみつ梅hachimitsu ume

honey plum

梅干しumeboshi

plain pickled plum: fine if just plum, salt, shiso

Where it hides

Plum onigiri at the konbini, bento, ochazuke, plum-and-shiso sushi rolls, snack plums.