Sanchoan

Sanchoan is a soba restaurant that dates back to the Edo period and is located close to Waseda University, at the Babashitacho intersection. Sanchoan is said to have created curry nanban, but there is one other dish that it's also said to have brought into the world: katsudon, or rather, the style of katsudon that became popular in the Tokyo area – served with a beaten egg, which is poured over the pork cutlet and partially cooked. The interior is spacious and the walls are covered with shikishi cards signed by all the well-known people who have eaten there. There is always a member of staff right by the door so you can order and pay when you enter, and receive a ticket for your food. The taste is exactly what you would hope for from a soba shop katsudon: light and easy to finish. Definitely worth a visit if you're in the area.