There are many ideas of cooking food while camping. I have read an article that you could use the foil to cook food at noon. The theory is to place the foil in a bowl and placing the food in the middle. The rays of the sun will hit all the sides of the foil and will be reflected to the food which is in the middle of the bowl.
I think this method is for people who don't like to start fire.
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It sounds interesting but I would wonder how hot it would need to be to properly cook something (meat for example), like if there is a safety temp or anything that way. I am sure certain foods might not be an issue but I would worry I might under cook it.
Interesting foil idea that I will have to try. I am always thinking of how to heat up a meal for lunch as I bring my lunch to work. I work for a cable company doing installs and service so my office is my van