The only reason i tasted it, is because i havent been to that particular place in a while, and i've quit smoking so my taste buds are back. I also suspect they may have accidently put too much in. I could taste it in my tikka masala, and it was even more evident in my girlfriends butter chicken.
I'm going to make another base sauce this coming week so when I make some curries i will try adding a bit of canned tomato soup into the curry and see if it makes a difference.
The curry was really nice and they are quite popular in our town. Not sure if this tomato soup thing is common with other restraunts? maybe they add it but not as much to distinguish the flavour.