I badly want to know how to do this technique. I've tried quite a lot - freezing, dry ice, agar. But it's very hard to cut the sheet in a nice shape, and keep it that way without tearing. And then, you heat it to melt it over the food (see second picture). Or under the food. Anyway, I want to do a very tidy harlequin pattern of sauce under meat, and I can't figure it out.
Alinea-mosaic used to have a video that didn't tell me much, but it's gone now.


*apologies to Khymos and some random internet for swiping the pix.