The Restaurant at The St. Regis Mumbai
The restaurant at The St. Regis Mumbai is endorsed by those who travel for a living. Out of 6 professionals tracked on TripExpert, 3 mentioned the restaurant, such as Jetsetter, Star Service and Oyster.
The St. Regis Mumbai 
Jetsetter
Star Service
Oyster
Jetsetter "Highlights at Seven, the buffet-style restaurant, include sushi, steamed dim sum and fresh Asian soups"
Star Service "Because this hotel is fairly new, it is still putting the finishing touches on four specialty restaurants, including one rooftop bar"
Oyster "As a business hotel though, it’s quite busy with crowded elevators, sometimes slow restaurant service, and an occasional cold atmosphere"
