Khan Chacha, which started operations in Khan Market in the '70s, is synonymous with Delhi's roomali roti rolls. So much so that when a member of the original owner's family was arrested recently in a digital financial fraud case, most reports identified him as a descendant of the Khan Chacha founder, though they no longer own the chain. But the restaurant is not the only one in the national capital rolling up a roomali meal-on-the-go.