Koyanagi is a traditional eel restaurant in a back alley of Asakusa, serving Tokyo-style unadon and grilled eel. The eel is steamed and then grilled, crisp outside and soft inside, with a sauce that is neither sweet nor salty served over rice. The old shop sits on a quiet back street, convenient to stop by after sightseeing in Asakusa, and draws customers even at weekday lunch. Those expecting a large eel will find the portion small.