MissAdventure
MerylStreep
MissA
Are you thinking of a Dutch oven used with hot coalsNope.
I've probably made the whole thing up, but this little thing was quite modern looking.
Never mind, it's getting on my wick now!
MissA I know of something that is near to what you describe, but it isn't a modern-looking gadget. For £1.65 you get a "Hot Pack Flameless Ration Heater Which Includes a Water Activation Sachet" You put your meal - which presumably could be something of your own in a boil-in-the-bag - into the outer bag with a wad of chemical-heating stuff, add a small amount of water and leave it for about 12 minutes. It gets really hot and heats the food.
www.hotpackmeals.co.uk/hot-pack-heates-with-water-sachet/
www.hotpackmeals.co.uk/how-hot-pack-works.html
I bought a couple of HotPack ready meals complete with heating packs, to keep ready in case of longer power cuts. Each of them includes the heater describes in the link. (No wonder the ready meals cost £8.49 each, as the heater alone is £1.65) Haven't tried one yet for Quality Control purposes, but I plan to report back when I do.
(I bought them on A****n, BTW, from Scout and GuideWorld, at www.amazon.co.uk/s?k=Action+Pack+Self+heating+Meal+Pouch&tag=gransnetforum-21 )
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