I googled a couple of videos on the instant grill - sold under different names by at least 3 companies - and it appears to use lava rock in the bottom and bamboo sticks for the top. One guy cooked hot dogs and said they were done, but overall the grill wasn't very hot.
I know bamboo will burn, so there couldn't be too much heat or flame. It will also explode if fresh and green from trapped moisture/steam.
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