Kawatoyo is one of the classic eel restaurants on Naritasan Omotesando. The draw is not only the unagi over rice, but the open-front preparation: fish split and grilled where passing visitors can see and smell what is coming.
Queues are common at busy times. If you are short on time before a flight, eat early or choose another Omotesando eel shop rather than turning lunch into a risk.