I came across this on the cheaprvliving forum and decided to give it a try.
http://www.cheaprvlivingforum.com/post/Cooking-with-a-Nissan-Thermos-5995048?trail=15
I’m making a breakfast of garbanzo beans and rice cooked by that method even as I type this. Seems to me there are some kinks to be worked out, but overall it’s a shockingly easy, economical, energy-efficient way to cook up a simple meal.