Glad you had success with it!
FYI..The chef discarded the onion liquid, which kinda surprised me. And they don't use carrot, celery, or potatos in base here. (Well, not that I've seen.) Also re:cooking time, the chef explained that the cooking time was VERY important, and a major part of getting the right flavour. Anyway let us know how you go making it into a curry. I'm about to knock up some base myself and see how I go.
Also, do you use "new" packet ground spices each time you cook, or do you grind up whole spices? And do you roast the spices first? I know the flavour can vary alot with the incorrect use of spices.