I too would like to know the bunjarra please Salvador.
There's a bunjarra / bunjara / spicy onion paste recipe on this site here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3921.0, and I've had great results using the onion paste recipe from p. 20 of Mick Crawford's pdf, though I tweak it a little (as I tweak everything - can't help myself!) by using a little less tandoori masala, cutting the teaspoon of sugar out (the caramelised onions are sweet enough for me), and adding a little tomato puree.
Mick is known as Curry Barking Mad on this forum, and you can get hold of his book in pdf form from here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3921.0 Fantastic value, and for me it's well worth it for the onion paste recipe alone.
A word of warning though. Do set aside anything up to an hour to make this properly. It's the slow caramelisation of the onions that's key to the success of a good bunjarra/bunjara, and you need to be watching over the pan like a hawk, stirring regularly (and being particularly vigilant towards the end). Don't use a heavy based pan that retains heat for hours after it's taken off the flame/hob. Your perfectly caramelised onions will continue to cook their way into pure carbon territory!
It's a dead simple process really, and once you've cracked it there's a good chance that you'll become hooked on the stuff, as I have.
Make a reasonable sized batch, and jar it. Keeps in the fridge for weeks.
If you can, try to leave some of your bunjara-ised curry overnight for sampling the next day. You should find the intensity levels have nearly doubled!