for karim (ismaili tip, shameless begging)
I'm afraid that I haven't had any success in locating any restaurants that serve Ismaili cuisine in either New York or London (I'm referring here to my definition of Ismaili cuisine which is a fusion of Indian and East African influences. I should also point out that Ismailis are found in many regions of the world and that my definition is, therefore, quite personal).
I have, however, managed to track down a couple of cookbooks that my family believes to be good representations of our cuisine. The books are "A Spicy Touch" Volumes I and II by Noorbanu Nimji (both are available on amazon.com). I hope this information is of some use. If I do find any restaurants, I'll let you know.