chanko restaurant
A restaurant specializing in chanko-nabe, the hearty hot pot dish associated with sumo wrestlers. Often run by former sumo wrestlers.
See also: ちゃんこ鍋
There are many famous chanko restaurants in Ryogoku.
Compound of ちゃんこ (chanko, a sumo wrestler's meal) and 屋 (shop). The exact origin of ちゃんこ is uncertain, but it likely derives from a term used in sumo stables.