Paste may or may not be a BIR thing, but it is Indian traditional from what I can gather. All I can say is that I had fun making it, although I'd probably only make half as much next time. Plus the first time I used it in a test sauce I was really happy with the result.
I again point out that I most likely have absolutely no idea of the taste of a BIR dish or a BRUM Balti, unless the industry over here is a copy and I don't know about it. I just enjoy this style of cooking and I'm really liking what I make.