It's certainly not a myth anyway...if you're long enough in the tooth to recall.
No it's not a myth
I was still buying curries of this flavour only a year ago
I know the chef who made them
He's about 60, so he has a lot of experience
I can't make these curries at home, but I know they are very simple
I obviously have not got the whole truth, but the base really comes down to onions and a savoury old oil
The base has "the" flavour
The curries are just variations on the base
A little hotter or a little creamier or a blob of fried garlic puree added at the end
The oil is the puzzle
It's thick, not a perfect liquid
I've seen white tower cans of it, stored in the fridge
I asked many times without a satisfactory answer
"How do you get the flavoured oil, I can't make it?"
the reply?
"fry something in it"
Not very helpful