In the 1970’s and 1980’s there were several books the either had characters that did it or promoted it.
Why is there no cooking tray in my new car’s engine bay?
Is it dangerous? (It would be less physically dangerous if there was a specific spot for it.)
I do not think we have the same idea of the process.
This is not running the car at the reunion to cook. This is cooking while driving to the reunion and using the waste heat. The process is similar to baking on a campfire.