BIR (British Indian Restaurant) cooking is a specific method used by takeaway restaurants to quickly cook curries using precooked ingredients. Typically, spices are fried in oil, ginger and garlic added, the mixture then quenched with a base gravy and/or watered down tomato puree. The rest of the ingredients are then added and heated through.
Traditionally, aluminium pans with a steel chefs spoon are used to stir and scrape the curry as it is cooked, and as the Maillard reaction causes the base gravy to caramelise to the pan, this is then scraped off and stirred back into the sauce.
Large aluminium stockpots are also used to prepare the base gravy which also contains acidic tomato.
There is an argument that these pans are used primarily due to their low cost, which may well be the main reason they are used. How much though, will using all this aluminium cookware contribute to that distinctive "takeaway" taste?