Earlier quoted context omitted.
It's in there. > At this location, researchers found that Neanderthals not only broke bones to extract marrow but also crushed large mammal bones into tens of thousands of fragments to render calorie-rich bone grease through heating them in water.
AFAIK Neanderthals didn't have clay pots - how would they hold the water to heat it and put the bone pieces in? EDIT: I asked claude and it doesn't know for sure but guessed "stone boiling into an organic container — animal stomach, hide, or a bark vessel — remains the most plausible explanation for how they heated the water."
Here, this isn't about boiling, but similar: "Because the Neanderthals had no pots, we presume that they soaked their seeds in a fold of an animal skin," says Chris Hunt, a genuine (checks) expert in cultural paleoecology.
https://archaeologymag.com/2022/11/neanderthals-cooked-surpr...