Ingenuity knows no limits. These ideas are great fun. Mary did you actually cook in a beanhole yet? were the coals embers from a wood fire or charcoal briquettes?
Nathan I could be wrong on this cos I was young during WW11 but I have never heard of the haybox in the U>K. I thought we all cooked with gas . We had an electric meter and a gas meter with a steel box attached into which we had to put shillings rather like a slot machine. Sometime during the evening the electric lights
or the gas stove would go out and somebody would call out "put a shilling in" and the lights
would come back on. As long as it was not in the "blackouts" which also occurred each evening.
Regardless of gas or electric imagine the shillings we have saved if we'de had a haybox.
Quite often the open coal fireplaces had an oven built into the wall above the and that would have been similar I guess. WOW!! The embers would have made a Great Beanpot in the garden.
I think Nathan you are right ,somebody must of had these great methods , maybe the rural areas..... Hmmmmmm I must research this.Sorry I rambled.