Tsurumaru Udon Tosabori is a small self-service udon shop in Tosabori, Osaka, serving udon and tempura. The menu includes mentaiko carbonara udon and kijami udon, with noodles that are smooth and chewy. It opens at 7 a.m.; customers place tempura on a tray, order udon, and carry it themselves, and there is a standing bar and simple chairs inside. Staff hurry customers to choose their order quickly.