This is one possibility; others might be cooking over a brazier, etc…

Here is Jamie Oliver's take on it:

"Cooking over an open fire is the oldest and most primitive method of cooking known, with glowing red flames and smoky ambers mostly lending themselves to frying, grilling and boiling. When camping in the great outdoors, the part I look forward to the most is setting up my little outdoor kitchen. If you’re a scout, you’ll almost certainly know how to start a small campfire. Otherwise, there are plenty of modern, portable open fire cooking stoves available to take along. It’s time to get creative too, since open fire cooking sets us all with a whole new cooking challenge."
Read more at http://www.jamieoliver.com/news-and-features/features/open-f...

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Note added at 9 mins (2015-10-19 14:53:45 GMT)
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or "open-fire cooking" of course, just to paraphrase it