As i investigate different ways to cook foods without using a lot of watts, I found this website on using a Thermos to cook meals.
It looks easy and fun. I have a few very nice steel vintage thermoses (thermii?) and this seems like a simple cooking method for a lazy cook like me. I've done a version of this while backpacking, using a Nalgene and hot water to make ramen, barley meals, couscous, and rehydrate things like beans.
It's like a vertical crockpot, in essence.
I could use my 4 cup coffeepot to make the hot water and only use 650 watts, then add the water to the thermos. In contrast, a microwave, electric kettle or electric stovetop use over 1000 watts.
It might not seem like a huge difference, but if i wanted to run my home off of a few solar panels, i could easily get away with a 650 watt expenditure to heat water, and then let the thermos do the rest of the cooking for absolutely free.