Doorless Dash... Hey, you weren’t there. ;^)
Boiled food probably antedates hard cookware like ceramic pots — the ingredients including the liquid was suspended in a skin bag.
Ovens, they probably had those, also wrapping food in leaves and such and burying them a little, they building the fire atop it, was the forerunner of the oven. In Polynesia that’s know as an Earth-oven, works for taters and sweet potato, fish, whatever.
Wow, nice typos, ‘Civ.
Can you boil water in a skin bag over a fire? Seems counterintuitive. You’d expect the flame to burn a hole in the skin. But maybe not, since the liquid inside would be cooling the skin, keeping it near 212 degrees, at least the inner layer. That would be a cool demonstration to see.