We need to denature those proteins by cooking it through or it's like eating blood flavored bubble gum, although pre fire they might have pounded it between two stones to pre masticate it, turning it into kind of a raw sausage.
As for cooking things through, consider that you can make grass baskets woven tightly enough to be impermeable to water, load your food and some water into it, and drop a rock heated in a fire on top of the food and end up with a stew a couple of hours later. Likewise, you build fire on top of any flattish rock, let it burn down to embers, and then brush away embers and ash and use the surface of the rock as your hot cooking surface, the earliest form of stove. Or you build a fire in a pit and let it burn down a bit, smother it with a bed of grass and leaves, put in the food, cover it with more grass, and shovel dirt over the whole business. Dinner will be cooked, smoked and ready to serve in about 3 hours.
There are lots of ways to cook food fully that don't require either a spit over a roaring fire or an iron or clay pot set on embers, methods that haven't really survived in the anthropological records but which are used today among tribal peoples who haven't been introduced to technology.
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