The staple dish of the sumo world is a hearty, filling one-pot meal, consisting of broth, vegetables, and meat or seafood, called nabe. When nabe is prepared by sumo wrestlers, it's called chanko-nabe, a name some believe refers to a sumo stable, master and his apprentices. The tradition of sumo wrestlers eating nabe supposedly began in the early 1900s, when star wrestler turned stable master, Hitachiyama, made a batch for his charges and realizing that the meal, usually cooked over a gas burner set on the table with diners gathered around, was not only nutritious and inexpensive but was also easy to prepare and eaten in a way that reinforced the communal aspect of the stable. It wasn't long before other stable masters were serving chanko-nabe, too. This recipe is from the sumo stable called Sadogatake.