Biochar and making sea salt/Stacking Functions

I think this is a good idea.You go to the sea.Pile up the washed off phragmites ,add material as needed and having on top a pot
with some litres of sea water to harvest what is left as a salt after the evaporation.Or you can do it at you site while making biochar.
What would you use as a pot to withstand the intense temperatures?
I went to the sea ,gathered 3 litres of seawater and i was amazed at the amount of sea salt that was produced from such a small amount of
water.I used electricity for this process ,so maybe next time i will try to stack some functions.

Nice idea! I would want to bring a TLUD  style charcoal maker to the beach and a stainless steel stock pot for the boiler.
With the right fittings, you could condense the water into a third vessel.
Three yields for one process!