I think this taste comes from the oil in the original base they make rather than re-claimed oil used afterwards.
That is a very good point
Perhaps that's it
Unless the curries really are very different
I can't speak for restaurants, where I have not seen them cook, but the ones round here don't hide where the oil comes from.
The first thing thaey do is drop the ladle into the curry base pot and scoop out a load of oil
They even use it from the deep pan fryer sometimes too
Try and get some of the curry base from your local
We can eliminate the questions if we do it by stages
I have had the base from mine and it is better than I can make
I know that
But my base is still a very good base
At least I know how close I am
I now have their spice mix
I must try and duplicate that too
With that I have had an amazing result
I can get all these basaar mixes at shops near me too
I think I saw about four different types
The one I glimpsed at the takeaway had a drawn picture of the world on it
The spice mix used for curries is definitely not hot though
That figures because they must use it for kormas as well as hotter curries (so they add the chilli later)