Shanghai Shuka, Nishi Shimbashi 上海酒家 西新橋
I have come to discover that the back streets of Nishi Shimbashi are dotted with lots of interesting Asian restaurants, including this one called Shanghai Shuka. It's very inexpensive, and the staff are all Chinese which assures one of the authenticity of the cooking. A great little place for lunch if you are in the area. It's also been featured on my favourite morning TV show "Asa no Vita" which is shown on TV Tokyo every week day at 8am. This is a great TV show if you are into food and it's well worth watching even if you can't understand it all.