In my experience, best curries are generally produced (by ANY BIR) on Thursday, Friday and Saturday nights...their busiest nights and, presumably, when their head chef is present.
Hi CA, I hope you're well! It's funny you should say that, I'm utterly convinced Thursday is the best day to get any takeaway. It's always so good!
I couldn't agree more on what you said about the head chef being present. My new local Asha is really good. The head chef there looks like a wise old monk with a long white beard. He's just great.
They're a really friendly bunch and I give my usual chat to see what info I can get. You can see into the kitchen - it's pretty standard stuff that is mentioned on the site. They don't use too much heat mind you... Also, they LOVE the veg ghee. I see loads of empty ones in the bin outside. I think it's mostly for the rice.
I speak to one younger worker quite often who is usually front of house. He says he's spent a couple of years in the kitchen working when it's not so busy. I was explaining how much I enjoyed their curry. I was also talking about which takeaways are good / bad. Oddly enough my other favorite is run by their friends.
Anyhow, this young guy was happy to discuss technique but insisted that the reason they get it better than me (I told him what I do and he says all the ingredients etc are correct) is because their more experienced chefs have been doing it for so long and are very proud of their trade. Makes sense to me. I certainly doubt that someone given the tools and some brief info about how to do my job would produce results like I do!
Ultimately I think what I'm getting at is that you can give 2 people the same ingredients and recipe and get very different results. Especially when it comes to spices - a little deviation from the recipe makes a substantial change. The experienced and skilled chefs present in the better BIRs will just have so much more of a feel for curry making than the layman. I'm not suggesting that this is where "the taste" is per say but I am saying that this explains the consistent high end result offered by a good BIR's curry. Mmmmmmm curry!!! ;D