Good post SL, I haven't ventured much further than Madras & basic curry for exactly the reasons you've mentioned. It's a test of this Maillard reaction/caramelisation, wok hei, or just plain singe/quench, which we now know to be crucial in achieving the taste. I'm not sure too many chefs would really understand exactly whats going on here either as it not something visual. I'm sure the hot pans have an effect on not just the oil /spice/GG/tomato, but the gravy also, & not by just plain reduction. The flavour changes I can get now & again over just a few seconds really are strange.
Although bland in comparison to the rest of the menu, the basic curry from my local has the taste in abundance, so using this as the control I've been attempting to replicate it.
I can't detect tomato at all, as in their bhuna which has plenty. The colour is almost the same as any base I've made, maybe even going towards yellow, which again may hint at no tomato paste. Ginger I'm not entirely sure, but definitely garlic, salt & methi.The exact spice mix is unknown. Coriander garnish. No other visible ingredients. I've also been trying out GM in place of MP, with tomato paste & methi, with some decent results
"rectum wrecker" ;D, I remember someone on here saying they "cut the chilli amount in half as they had work the next day" ;D That made me laugh, although I'm not sure it was a joke

Regards
ELW