Place your food in the center of the foil. Bring the long edges of the foil up to meet, and then fold them over a couple of times, creating a seam that runs over the top of your food. Then working with one end at a time, fold it over a few times to seal the end. I like this method for folding a foil packet because it's easy to open the seal on top to check them for doneness and then close, if necessary, and it also creates an easy pouch for eating when opened.