Cooking in volcanic hot spring vents - GIF

[jdurand]

When we were in the Canary Islands we ate at a restaurant at the top of a cinder pile. The ground was warm to walk on and they had some demonstration pits dug a couple of meters deep. Toss in dry branches and POOF, instant fire. Pour water into a pipe sunk into the ground and you have a geyser.

Dinner was cooked over what looked like a water well, round stone wall surrounding a deep pit. The air coming up was hot enough to nicely cook the beef, chicken, and fish they served.