Bhuna-boy - Turmeric is a colourant, the flavour being generally described as "wet cardboard".? I would be astonished if this could impart smokiness!
Curry Queen - Yes I will try your sesame oil recipe, but I would be surprised if such a non-indian oil was the basis of almost all UK Tarka Dhal recipes?? My quest for Smokey Tarka Dhal has lead me to many new really lovely dhals, all I've been glad to find, though none yet has been smokey.
CurryCanuck - Am in the process of experimenting with dhal frying.? Do you use a relatively liquid dhal (eg red lentils, which even after draining are still a liquid mush) or more solid dhals like split peas, which can be drained to leave a drier solid?? I'm just wondering if your frying trick requires a less liquid dhal, so that the oil isn't instantly cooled?
If you've ever had a truly smoked food, the smoke taste is unmistakable, if that makes things any clearer?!? I had started to wonder whether restaurants had some trick involving the tandoor (my local restaurant's is wood-fuelled, though many others are electric/gas) to quite literally put some kind of smoke taste into an ingredient?? Just a daft idea.
What I do know is that Indian Chefs can be very protective of their recipes.? In my local BIR, the owner told me that the chef sends him out of the way (on some errand) so that he can prepare his spice mixtures etc in secret!