Do BIR's not use their base gravy's immediately after cooking and store in the fridge to allow the spices to infuse,I don't know 
I know several places that cook the base, then fridge it when cool
They use it for three days (unless extra busy)
It's not used fresh
I made the Zaal base, and several curries from it
I thought it was average at the time, and froze a few curries
When I reheated one, in my microwave, I thought it was restaurant quality
Extremely good
Very pleased
There are so many recipes, on Cr0 to try
I keep getting sidetracked
I must do some more Zaal recipes