"Chenab" is clearly one of the best (Indian) restaurants in Berlin. I have eaten there very often (more than 30 times) and I was always at least satisfied and happy, but also overwhelmed several times. Chenab offers an extensive selection of delicious vegetarian dishes. Carnivore friends told me the meat there was not the absolute top quality, but as a vegetarian I cannot judge and I do not want to ;).
I can highly recommend to try "Safrani Pista Korma", "Shahi Bengen" or the banana curry and, of course--like in any good Indian restaurat, the Batura bread, masala chai, mango lassi and the devilishly delicious "Gulab Jamun".
Caution: About a year ago, the owner of this restaurant has changed. Before that, the restaurant was called "Chennai". I have never been to "Chennai", but from different sides, I've heard that there were major problems with the old owner and that the restaurant had a bad name.Pros: Excellent food, Lots of vegetarian dishes, Nice staff