Wouldn't it be handy if you could buy canned or bottled base sauce?
Hi Ootini,
I make a concentrated base similar to Razor's excellent base puree,
http://www.curry-recipes.co.uk/curry/index.php?topic=5189.0 because freezer space is limited, but I omit the spices. My thinking here is that the more spice you have in the base the less versatile it becomes, and as I'll be adding some at the cooking stage anyway I don't see it as much of a time saver.
I expect a commercial base would have to do the same, but where would be the market? BIRs could probably still make their own cheaper and supermarket customers might assume it is a cook-in sauce and be disappointed with the results, unless they read the directions on the label first, decided it was all too complicated and put it back on the shelf. Perhaps I'm being too pessimistic and someone will eventually do it, perhaps in large containers aimed at the catering trade.
Having said that, my local Asian supermarket does stock big jars of cooked onion puree, but prepared with olive oil. Haven't lurked long enough to check out who buys these though, anyone tried them?
Rob