A new trend in Japan has people enjoying thick slices of butter on their sushi. Specifically on unagi, also known as freshwater eel.

Jinen, a Japanese restaurant chain, has added the new unagi butter sushi dish to its menu. Featuring vinegar rice topped with a slice of unagi, a generous pat of butter and held together with nori seaweed.

RocketNews24 reports that this might be the richest sushi ever. Fans of the traditional unagi sushi dish will know that the freshwater eel is already rich in flavor. Now, combine that with a heap of butter.

Apparently, when fused, the warm eel and butter just melt in your mouth. Sources say that most of the diners who have tried the combination of butter and eel have been delighted with the taste and instantly hooked.

The more we hear about it, the more we want to run towards our nearest sushi spot with a tub of Country Crock.

Photo: Twitter