I've seen these in action at my local farmer's market some years ago. They DO work as the pots of simmering, bubbling stew I witnessed proved. That said, their real usefulness is quite limited and DO NOT try to use them if the wind is more than a "gentle breeze". They aren't quite a gimmick, but they're close to a gimmick for anyone but a true "back to nature" person (although where would a no technology person find aluminum foil?).
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