I've heard of people cooking porridge overnight in a wide-neck Thermos flask. They put the ingredients and some boiling water in last thing at night, give it a shake, and leave it on its side.
Hobs loose their 'peak' heat very quickly. But they often remain warm for a while.
I've never had so much as a scorch mark on my towels. That's because the base of the casserole dish completely covers the hob, so direct contact can't happen between towel and hob.
We used this technique during fieldwork in the Lesotho Highlands. It helped conserve a very limited resource (gas tanks for cooking) and the food turned out well. The only problem was negotiating for the return of your towel to enable some attempt at personal hygiene, as we had not anticipated the ban on flying in replacement gas cannisters, and hence the need for additional towels.
Let me know how it works out. I'd be very interested to know. (You can use dense foam, or pretty much any other insulator as well as hay - an old duvet would probably be ideal)
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I've never had so much as a scorch mark on my towels. That's because the base of the casserole dish completely covers the hob, so direct contact can't happen between towel and hob.
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