Cory / Ray
When I look at the seed they used, it does look like a very slightly smaller seed to fennel. Characteristically, its tastes as the name suggests, as aniseed, but you get a slight hit of heat at the very back of your mouth after the taste has dissipated.
I have now Googled aniseed and have a better idea of what it looks like. Looking closer at the seed in the onion mix, it is not uniform at all. Most definitely, there is aniseed in it and but also look like fennel seed is in it too. I will study the hi-res image tonight when I get home and make a conclusion.
When all is said and done, they refer to it as aniseed, so I will change the ingredient in the initial recipe above.
Josh,
I have had a stab at breaking this down in the topic Ray mentions. You need to scroll down through it to post six. This should do it:
http://www.curry-recipes.co.uk/curry/index.php?topic=4396.msg40688#msg40688Having been given an open invite to return, I hope to see the base made up from start to finish. I will endeavour to take pictures and post it up as I have done here.