Im of the net for a few days and suddenly the forums as busy as ive ever seen it!! :
Anyway just my 2$
I don't think theres a secret ingredient as already been said how could it have been kept so secret. I think its not so much something missing as too much added, keep the base simple, quick and cheap. I don't belive it makes any differnce for the better cooking it for 4 hours as opposed to 1 hour, the sauce seems to take on a different\better taste after standing for a while. Im sure the currys themselves need to be cooked quick as well or "that" taste goes, cooking it too much just ruins the flavour. The gravy needs to be hot before it goes into the curry, this alone I think makes a major differnce to "that" taste.

Anyway just my 2$
I don't think theres a secret ingredient as already been said how could it have been kept so secret. I think its not so much something missing as too much added, keep the base simple, quick and cheap. I don't belive it makes any differnce for the better cooking it for 4 hours as opposed to 1 hour, the sauce seems to take on a different\better taste after standing for a while. Im sure the currys themselves need to be cooked quick as well or "that" taste goes, cooking it too much just ruins the flavour. The gravy needs to be hot before it goes into the curry, this alone I think makes a major differnce to "that" taste.