We still have a few people alive here who learned to cook in the pre-European way. Not many, but there are also photos in the archives, paintings (emily carr for example), written accounts and oral accounts of how they used to cook on the coast here. Reading the journals of Captain Cook and some of his shipmates, you can see a lot of accounts of different cooking methods. I can't remember his name, but the ship's doctor's journals go into even more detail than cooks' journals and logs. So it's kind of funny to me to hear the video say that we have to guess how people cooked before. Some of those ways suggested are way more work and dangerous than we can see from these accounts.
There's very little clay on our Island. The usual way to cook is to not use a cooking pot. Roasting, searing, wrapping in moist leaves and putting on top of the coals at the end of the fire for a gentle steam, make a hole in the ground and light the fire, get it nice and hot, then burry the food over top of the fire. Smoking was another way - make a little hut-like structure to hang fish and other things over a smoking fire was very popular. But mostly steaming wrapped in leaves was really popular at least in the general area where I live.
When a pot was required, a basket was woven and depending on the materials available, it could be just bark or it could be different materials and coated with sap on the outside. Whatever was needed to make it waterproof. Skins were used in some areas - I think Mongolia still has places that use this. We have evidence in East Anglia (England) where they used bladders when cooking pots were scarce or the people were too poor - but they learned this from Arab cultures in what is now Spain and the food can be traced back a few more hundred years through the Middle East. (and forward to the Highland Clearances to eventually become haggis)
But on the coast here, they used mostly baskets (lots of cultures and lots of variation between families) made waterproof in some way.
There were special cooking stones passed down from mother to daughter - and also used as (the
local equivalent of what we would call) dowery and trade items. These were heated in the fire, then placed in the
water in the basket until the water came to a scant boil.
This method is extremely dangerous as rocks heated in this way can explode. The people with the skill to find good rocks were highly prised. The rock not only needed to not explode, but also needed to retain and transfer heat in the desired way. There was quite a science to it and when one of these rocks were found they were treated as precious.