Some nice 'Singe work' there,chewytikka.

It's surprising how far you can go without burning,even on a high gas flame.
I had a go tonight with Abdul's madras,and like you, i start with a tarka and follow with g&g, tom paste,lemon and spices.
After about a minute or so of singeing,i got a full whack right up my nose,so took that as my cue to proceed to the next stage.
The spices weren't burnt,but some of the onion from the tarka was starting to go a little,so i put my first ladle of gravy in.
Finished the curry and ate.
And very nice it was too.
There was a definite improvement,but not the WOW factor i was expecting(maybe i've always been singeing the spices to a certain degree but just never noticed?)
I will try and take it a little further next time and maybe add the tom paste/spices before the tarka's fully cooked out;That way i wont risk burning it.
Oh before i go,chewytikka,could you please tell me what your Tomato paste is diluted to ?
Thanks.