I bought a dozen beautiful, red scotch bonnet chillies from my corner shop today and knocked up a chilli sauce with them. Roasted them off until they were nice and brown alongside a few cloves of garlic. Then boiled them in distilled malt vinegar with sugar and salt for half an hour. Let it cool and blended to a smooth sauce.
Now while I was doing the boiling I mashed the peppers a few times with a fork, had a lick of the residue and thought "bloody hell that's potent!". So after the blending I cautiously tatsed a tiny amount and it was pretty good. It was definitely hot, burnt the lips a little but it felt like it had mellowed in the cooking compared to the tasting done while boiling and it had a good flavour.
But then, oh my God!
The chilli heat swept over my forehead and moved backward over my scalp followed by profuse sweating. The chilli heat rose and rose and rose in my mouth and particularly on the tongue. My lips were on fire - all of this building oh so gradually. I actually felt a litttle queasy and faint!

It would appear that despite being a veteran of Phals, I've finally found my match. The humble scotch bonnet; slow acting but all the power of an atomic bomb, if atomic bombs could be rated in Scovilles!
Have I just turned excessively wimpy in my old age or does anyone else find these chillies have the same effect on them?
One thing's for sure, if you're looking for a slow build up of chilli heat in your curries this has to be the answer.