It would be really interesting to know all the details of mass producing curry in a busy bir. For example vindaloo includes a few pre cooked potatoes. these potatoes are pre cooked with spices, in bulk, and then stored in the fridge ready to drop into the vindaloo during dish preperation. There must be lots of other similar bulk preperation happening which we dont know about. for example making chicken tikka in bulk. perhaps the leftover sauces are somehow fed back into the base, or final dish to increase flavor. If anyone has friends who work in bir restaurants, maybe they could get some insider info on this, and report back. I know 2 bir waiters who mentioned the importance of bulk cooking to getting that bir taste. both stated thats why you can't do it at home! not sure i believe that, but hey, its worth pursueing.