I hadn't considered that Phil. Good idea. I just thought it may have been what SS was looking for but it's blocked and I'd not encountered this before.
This all seems to have taken place during a period of unrest within the forum. A particular member involved at the time, threatened to start a new forum of his own and fund it personally. Apparently he did. Before my time.
So far my reading about Bunjarra / onion paste shows it is time consuming to make and tricky to achieve a good result. Also, the results are mixed and I didn't find much to say many were overly enthused by it, although some said it did add depth and another layer to their curry and they felt closer to the end goal. Still not there though.
Masala Mark's Aussie IR onion base (paste) is quite similar in all respects.