General opinion is that the stones found in burnt mounds were used for saunas and not for cooking because no bones or cooking artefacts are found near them.
I`ve never heard of metal cauldrons being used in the bronze age. The stones weren`t thrown into water; the water was poured onto the heated stones.
You have be to careful as to what stones you use as some explode when cold water is poured onto them.
The sauna itself would have been erected near to the burnt mound, probably with a wooden frame covered by animal skins.
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