Why roast one marshmallow when you can roast four? Or, alternatively, why use a grill when you could cook an entire burger on a stick? Step up the campfire with a simple four-pronged toasting fork.
All you need to make this is a simple pocketknife and two sticks. Just split the larger stick about four inches down, then turn your knife 90 degrees and do it again. Split the smaller stick in two and place them inside the cuts to split up the ends. After sharpening the ends, you'll have a much more useful toasting fork from which you can toast multiple small items, or larger items like burgers and bread. Hit the link for the more detailed instructions.
Campfire Toasting Fork [Instructables]