By accident most likely, while foraging in areas damaged by wildfire.
This would have happened hundreds of thousands of years ago, long before written language or cultural memory that would preserve any specific details.
What we do know is that some uncontacted tribes didn’t have fire-starting technology and had to endlessly tend to fires they’d picked up from natural sources. That suggests that cooking predates fire-starting.
The cave man often ate things like cold fruits and cold veggies, and when he went out and killed something they would eat it raw. Which is an eww🤮 for me. Logically I think that there was some kind of fire maybe started by lightning and of course some animals were burned to death. Perhaps the cave man ate the burned flesh and though “unga bunga WOOOW burn taste good” that’s my educated guess of how we started cooking meat over a fire. Its logical.🖖
> Not only meat but also pastries how did we discover that flour and water make bread for instance
You have some grains. Maybe they taste better if you grind them up and mix them with water. Oops, you accidentally spilled the slurry into the fireplace. Maybe you can still eat the part that’s spilled on one of the hot stones. Hmmm, it has hardened to something that actually tastes good.
No one knows for sure but the commonly believed hypothesis is that an ancestor scavenged an animal from a forest fire. The fire’s would have been common enough that his tribe would have been able to do it seasonally. They would have been healthier and better fed during this period of the year and after many generations they adopted the practice in an “artificial” manor.
You start by making gruel, like oatmeal. You accidently leave it too long and it gets fizzy and you get beer, more or less. Take the same stuff, draining the liquid, cause you drank the beer, and try to heat it up for dinner and you’ve got some primitive bread, depending on if you mashed up the grains.
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