Asakusa Unana is a shop near Sensoji that sells small rice balls filled with eel. The rice is chewy and the eel is soft, and you can choose between a regular flavor and a spicy version with sansho pepper. You order first at a kiosk, then return at the time written on your number ticket to pick up your food, and the ordering area and eating area are separate. On weekends, pickup can take up to three hours.