If you are soba freak, go to Shirogane, hidden holy land. One of best is Muho near Shorogane Takanawa st.
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2nd. Best Yakitori (Grilled chicken) at Shinagawa station is Tori-Tetsu in Konan area.
This is a top of top soba restaurant, Sango-an in Shirogane. Even listed in Micheline, lunch cost you from 800
If you are in the mood of Chinese, go Osho of Gyoza (Dumplin). 1,000 yen will satisfy you including beer on tap.
Good authentic Belgian restaurant in Shinagawa St.