I visited the Tsunahachi tempura restaurant at the Daimaru food floor above Tokyo Station again but went there for dinner instead of lunch. The price is a little higher than the lunch specials but well worth it. I ordered one of the omakase seafood choices, about Y4000 plus beer and was not disappointed. They have an English menu if you ask for it but I didn’t need it because I chose one of the specials from the window display at the entrance. If you’re budget constrained you should try this restaurant at lunch time where it is positively a bargain.
Tempura, when prepared correctly is not greasy, heavy or overwhelming. It has a delicate taste and should be eaten immediately after leaving the oil. Sitting at the counter is optimal for the best eating experience.