A fair few people are whacking away at poor old KD here! KD's curry recipes don't work for me and, for example, that chicken curry which adds jeera and garam marsala right at the end, virtually raw, looks a fatal step in hindsight.
What KD did however was to introduce me (way back then) to the concept of curry sauce based on garlic, ginger, onion and tomato - as well as the idea of pre-cooking the meat (albeit then throwing out the juices, alas). Still KD has done well out of the book because it took people a step closer (and some stopped there, satisfied). Not me.
Combing through many of the posts here, amazed at the erudition

(possibly deserving PhDs in certain cases), I?ll confess I'm a scientist too and the following insights have come to me:
(1) The medium that carries the taste and aroma of the spices - their essential oils - into the meat is OIL in large quantity. Chemically speaking the oil concentrates them as water never could (chemists, say "partition coefficient"). Too little oil and the essences are lost.
(2) TEMPERATURE has to be high. Higher than almost any household hob can manage (unless you make tiny quantities). High enough to extract those essential oils from the spices AND to impart a delicious 'singed' aroma to your curry! You curry ought to taste like a badly ventilated Indian restaurant smells!
(3) You ought not to eat "BIR" style curry too often - not only are there vast amounts of oil BUT the high temperatures used will have 'cracked' the oil (and other chemical components) into new compounds, some of which may be very bad for you.
(4) If you want to duplicate these dishes at home, get a huge gas ring and set it up like your BBQ in the garden - and be prepared for that area to look pretty squalid in short order! (Oil splattered all over). Loss of friendly neighbours and a fall in local house prices should not deter you.
(5) Australians are not rated too highly for their curries. I think this is not quite fair but confess that one of the worst curries I ever had was at the Raj in Melbourne (famous for the cricket memorabilia all over its walls but quite infamous for its curries in ad. 2000). Sure there are good restaurants there, have to be!
Please know that I am no upstart, even though I just found this excellent forum - I have been trying (and failing) to cook curries restaurant style since my first addiction in London in 1960.