Marugame is a Japanese noodle shop serving udon and tempura on the second-floor dining area of Waterloo Station in London. It offers tonkotsu udon and kake udon, and you pick up tempura just before paying. A regular-size udon suits a normal appetite, and the broth's seasoning can be adjusted with the accompanying toppings. The ordering flow is organized, so the process moves quickly through to payment.