I believe it is caster/granulated sugar, coconut flour and (cheap) lemon juice.
They use the same technique in the fatima restaurant video, minus the lemon i think. They 'toast' the powders first too.
I now use this technique and it produces an exact BIR replica. It is very easy and cheap. It is a lot of sugar but then korma is sweet, which you will obviously have realized if you eat korma!
Remember that sugar is not very strong compared to the equivalents of salt, MSG or citric acid.