These are perfect because you pre make them before you leave the house!  Make a few different packs each serving a few people.  On a large sheet of heavy duty tin foil place a few sliced potatoes with a  dollop of butter or oil and salt, pepper and fresh herbs.  You can season these however you like, salsa, cayenne etc!  Fold them up tightly and then place them in, yes in the fire to cook for about 20 minutes!