It depends whether you are looking for current BIR taste or 1960's taste. I have seen (and cooked in) some BIR kitchens and I can honestly say that there was no used oil used, no bunjarra, no MSG and no jaggery. It's all in the magic of the technique. Even the base sauce makes little difference to the finished product, it is there mainly as a bulking ingredient. In the 60's they would stick chicken carcasses in the base pot to make the base a lot more flavoursome. They may well have recycled used oil too but both practices are more frowned upon now. Especially as they used to make vegetarian curries with the chicken stock base!
If you ever get a chance to look in a kitchen (some are open plan these days) watch the first 20 seconds, that's when the magic happens. After that its just a case of adding the base and reducing down.
If you ever get a chance to look in a kitchen (some are open plan these days) watch the first 20 seconds, that's when the magic happens. After that its just a case of adding the base and reducing down.