I was in a takeaway kitchen about 8 years ago
They were making up a new base and Yes, the old base (which wasn't much) went into the new
All the reclaimed oil went in, and new oil as well
When this chef heats up his curry gravy, for an ordered curry, the aroma is just magic
everything I love about curry, is pretty much there, to start with
Can't be done at home
If I ran a restaurant it would be no problem
It's a combination of elements you can't do with an 8 onion base and just using fresh ingredients