On 08/07/2016 at 4:34 PM, lesliec said:The way I'd heard it, you touch your thumb to different fingers on the same hand then use the forefinger of the other hand to feel the different degrees of squish in the fleshy part of your thumb. This is much easier to do than describe!
Yes, that is how I heard it. I'm sure I've seen videos on YouTube showing the technique. I vaguely remember, I think, Gordon Ramsay demonstrating it, but that may be a false memory.
(I tried to take some pictures to illustrate, but realised I would need three hands, so gave up on that.)
Whatever, I still don't think much of it as an idea. Temperature is the surest guide.