There's no point in harping on about it, it works and that's what ultimately matters...doesn't it?
I'm not really saying it doesn't work. I'm saying, I don't understand why it works.
You really need to try it (or Taz's which is a very similar method).
I've tried the Taz method a long time ago and I agree it produces good results, but I still didn't like the amount of oil it produced. There's a major difference between how the two techniques work though, the Taz method uses a lot of reduction to fry the spices, to the point the oil separates from the sauce.
I saw very little reduction going on in this glasgow base (for the simple reason that far less was used to begin with) which is the basis for my comments as to how the g/g, tomato and spices were cooked and fried. I saw no separation of the oil from the base sauce. With the Taz method you get pools of oil, this is what the spices fry in, I saw none in this one.
How does the g/g, tomato paste/spices etc fry in oil if so little of it is separating from the sauce?