Hi CA,
There is a subtle smokeyness to the normal Butter Chicken, which I think actually comes from the fried onions.
As BB mentioned, they are fried/cooked in oil until very dark brown and caramelized, probably further than caramelized and then the other things go in at various stages. BTW, thanks BB for the explanation in your post, I couldn't have said it better myself.
However, as the people you have talked to have mentioned, the smokeyness also comes from the chicken tikka. But it doesn't necessarily have to come from the tandoor. The Butter Chicken is normally made from pre-cooked chicken and most times so too is the CTM. However in the last class that we did, we did CTM with the chicken cooked in the oven. The dish had a great smokeyness to it and it was just done in the oven, 200C for 20 mins, then chopped into small pieces. I remember being quite surprised at how good it came out from the oven compared with the tandoor chicken.
Also, we don't use any pastes at all, so no Pataks/Pascos or anything like that in the marinades.
The butter gravy is similar to the ones where I had a chef come out and teach me at home, it was his version of the same thing. This is by far superior and from what I still consider the best tasting Indian food in Brisbane, I was just lucky to meet the Chef in my quest to learn how it is done.
I've got a bit of footage that I have to edit together of some tandoori chicken being cooked as well.
Cheers,
Mark