Just found this thread, which inspired me to hook out all my PC books. (I thought I had them all, but haven't got North Indian Curries, Unclefrank. Any good?)
I'm not sure why there should be any hostility towards the man. While it's true that his books didn't help me to attain the holy grail of BIR, I found them interesting and full of information about my favourite food.
Flicking through 'Bangladeshi Restaurant Curries', I was intrigued to read, under the section entitled 'Bangladeshi Curry Processes', that the most important process is the bhoona (or bhuna), in which the essential or volatile oils from whole or ground spices are released by frying in ghee or oil. Okay, nothing new there, but he goes on to explain that "an initial high temperature is required".
Could this be an early reference to 'singeing'?
He goes on to say that for this process ghee is better than oil. "This is because ghee, being very clarified, reaches a higher temperature before it burns and therefore allows the spices to be taken to a higher temperature before they burn."
I must admit I tend to use oil most of the time, but shall be getting the ghee out for a bit of singeing when I make tonight's vindaloo to test the theory out...