I have just made and eaten this. The sauce makes enough for 6 main meals.
I only put in one cinnamon stick of about 3", and I took it out after a while, but it was still a bit too much. If I was to make it again (which I will) then I might even leave out the cinnamon.
I added some carrot in the first step before blending.
I usually find BIR too salty for my liking. I didn't add any salt at all and it really didn't need the salt.
Really superb balance of flavours, best that I've made, but watch that cinnamon.
I served it with a biryani rice which was pilau rice with potato, cauliflower, green beans, peas, cashews, fresh coriander, sliced tomato, sliced egg, and sliced cucumber. The biryani rice was spot-on BIR.