Milbona Sweetened Condensed milk from Lidl is I have found the route to a BIR style Korma, as the boiled spices in a base sauce (even if fried off first) can be a little 'raw'. I use Mick Crawfords base sauce, but with no tomato at all.
Well hay it works for me, I have no idea of the nutritional values on the side of the cans I used last week in a 12 portion saucepanful i made for my Petanque after-match buffet. No complaints, but then I supplied it FOC, with thigh meat instead of breast, Tandoor style - or as close as I could get with a 250degree max oven.