Hi Chilli,
I had some base in the freezer, so I had a go at 'fusing' as you suggest. I don't think I was very successfully however, but I think that was down to the fact that (I assume ) I may have burnt the spices.
I had the oil at smoking point, then tipped in a few onions, then some puree and the spices. I fried this lot for about a minute on full bore, before introducing the sauce, a bit at a time. I didn't notice any nice smells as I pressed the sauce against the bottom of the pan, but I figured this was because I'd already ruined it by overdoing the spices - maybe I should have started on a lower heat, then turned it up for fusing.
I'm still keen to have another go. I guessed that the fusing is a way of superheating the sauce, the spoon keeping it in contact with the very hot surface and the oil in the sauce (evenly distributed, which is why I blitzed it before use) frying the sauce locally.
I look forward to seeing the your video, but will still have another go in the meantime. I've a feeling that this is one of those things that will take a fair bit of skill and practice. The experts, who do this all the time will make it look effortless, like those blokes that split slates, or put the gold lining on cups and plates.
It still turned out OK though, once I teamed it up with some decent rice and a bottle of Cobra.
A8