Use a cast iron "pocket pie" maker (you can buy them at camping stores - it's essentially a pie maker on a stick). Grease the inside with butter or olive oil. Put a slice of bread on each side of the pie maker (some will hang over the edge). Put some pepperoni, cheese and sauce in the center of one slice. Carefully close the pie maker and cut off the edges of the bread outside of the pie maker. Put the pie maker in the hot coals of the campfire. Check every minute to see if it's done - the pie will be sealed and the outside will be toasted. Stick a knife in to see if it's hot all the way through. Carefully remove the pocket pie from the pie maker and enjoy! This is a favorite!