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I'm wondering about building a metal rack with horizontal members which sit stably in the embers and vertical members on which potatoes are impaled, some distance above the embers. In my mind, the radiant heat from the embers is lessened by the distance yet heat is conducted by the metal of the rack...

How can I cook potatoes in the embers of a fire over night? I want to put them in the evening and then have them ready for breakfast but attempts up to now have resulted in rather charred examples by morning. I recall seeing on Edwardian farm the characters cooking potatoes in brick clay but I don't...