I instantly thought of Sables when I saw this post, but couldn't quite remember the name. I used to live up there and always got the lobster salad on a bagel. It was kind of decadent and very delicious.
My boyfriend has made it his personal goal to find the best lobster salad in the city (he's slightly obsessed) and he claims Sable's wins the title. For the best lobster rolls, however, we like to go to Pearl Oyster Bar.