I was idly watching adverts on the telly recently (I try not to, but it’s hard!) when I saw some buns being baked in what looked like origami dishes.
A quick pause to fetch the camera, the results shown here. A google image search for “folded buncases” brought up several with the same idea – for example, here’s a page with several on offer.
So, the obvious question is, how are they folded? It must be a mechanical process. I may buy several and try to deconstruct or dissect them (in the interests of origami knowledge, of course).