Though I live out of the city now, feel free to ask any queries you have. I happen to know Kolkata, especially Saltlake and nearby area very well. So, at your service, but you will owe me a ice-cream next time I go home.
Now, below is a list of well known Kolkata restaurants and their specialty:
Bengali:
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1. Bhojohori Manna - Gariahat/Saltlake/Hazra/Hatibagan
2. Kewpie's Kitchen - Elgin Road
3. Nola - Lake Town/Lansdown/Baguiati/Keshtopur
4. Oh! Calcutta - Elgin Road
5. 6 Ballygunge Place - Ballygunge
Chinese:
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1. Mocambo - Park Street
2. Chung Wah - Central Avenue
3. Hong Kong Chinese - Kankurgachhi
4. Kowloon - New Alipore
5. Lord's - Ultadanga
6. Mainland China - Gurusaday Road
7. Mouline Rouge - Park Street
8. Red Hot Chilli Pepper - Salt Lake
9. Trincas - Park Street
10. Waldorf - Park Street
Indian/Continental/Mughlai:
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1. Zeeshan - Park Circus
2. Sourav's - Park Street
3. Royal Orchid - Ultadanga
4. Shiraz - Salt Lake
5. Orkos - Salt Lake, City Center
6. Peter Cat - Park Street
7. Magnolia - Park Street
8. Haka - Salt Lake, City Center
9. Hatari - Deshopriyo Park
10. Honey Da Dhaba - Ultadanga
11. Grain of Salt - Camac Street
12. Dilli Darbar - Ultadanga
And some in salt lake:
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1. BB's Multicuisine - Sector V
2. Guchhi - JA Block
3. Mishra's - DG block
4. Red Hot Chilli Pepper - Sector V
5. Zest - BE Block