Old Delhi. Probably the area near Jama Masjid. There are plenty of shops which serves really tasty Kabaabs.
Al kauser, ASLAM —jama masjid
Rajinder da dhaba opp. Safdarjung enclave
There's a shop at Jama Masjid by name 'Ya Allah', best seekh kebabs are there
There were three in line just in front of jama masjid all used to taste equally good
Jama Masjid is the best place for this!