The aliens were caught and preserved by canning in Japan.
Why don't you get the can?
You shouldn't miss eating it when you come to Japan.
Actually these are two octopuses and some taros.
It is a Japanese traditional simmered food seasoned with soy sauce flavor and it tastes a bit sweet. This can is good for souvenir.
Product name: Imodako いもだこ
https://www.fukuraya.com/?pid=12862048 (in Japanese)
A recommended bar to eat this can.
Bar name: mr.kanso
* It might be sold out or not available in the bars though.