Sorry guys, I meant "cooking over an open fire." Setting campfire smores and charcoal grills aside, this is a pretty primitive way of cooking. If you came from a place where this was your only option for heating your food, you'd be astounded at the cleanliness and ease provided by any modern gas or electric range.

For most of human history, the vast majority of people cooked their food over open fires. Cooking with anything more advanced is an aspect of modern living that is only a very recent development, especially given that the time scale I was addressing is a billion years long.