I tried a slightly scaled down version of this base today. It looked and smelt almost perfect before final 10 min simmer. To save a bit of time I dumped 1.5 kg of chicken in to precook, which turned out nice. It did however, seem to thicken the gravy and in hindsight I should have added a touch more water. 1.6kg of onions got me 2.7 litres of gravy, but I would have expected a bit more
Regardless I'm happy with my efforts as it is only the second time I have done a garabi.
I'll knock up a curry tomorrow night and find if it worked out.
Thanks for all your help.