If you are soba freak, go to Shirogane, hidden holy land. One of best is Muho near Shorogane Takanawa st.
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You don’t need to buy expensive SAKE. Komedake-no-Sake 800yen/2L is adorable enough.
2nd. Best Yakitori (Grilled chicken) at Shinagawa station is Tori-Tetsu in Konan area.
If you like more secret place, try Rogetsuan or Nioka, next best but ones of top in Japan.
Good authentic Belgian restaurant in Shinagawa St.