Chankonabe

Chankonabe is a Japanese stew (a type of nabemono or one-pot dish) commonly eaten in vast quantity by sumo wrestlers as part of a weight-gain diet. The dish contains a dashi or chicken broth soup base with sake or mirin to add flavor. The dish is not made according to a fixed recipe and often contains whatever is available to the cook; the bulk is made up of large quantities of protein sources such as chicken (quartered, skin left on), fish (fried and made into balls), tofu, or sometimes beef, and vegetables (daikon, bok choy, etc.). While considered a reasonably healthy dish in its own right, chankonabe is very protein-rich and usually served in massive quantities, with beer and rice to increase their caloric intake. Leftover chankonabe broth can also later be used as broth for sōmen or udon noodles.

Source: Wikipedia