Sorry to start a new thread. I was directed to do so.

I have looked through this and associated threads

Mick's/Taz's Curry Base Gravy can be found here:  https://curry-recipes.co.uk/curry/index.php?topic=4163.0

Mick's/Taz's Dopiaza recipe can be found here:  https://curry-recipes.co.uk/curry/index.php?topic=4165.msg37738;topicseen#msg37738

I'm sure I saw a reference to a video related to the technique used.
Is there a video?