At the campsite: Lay out 4 pieces of foil. Slice the bananas in half lengthwise. Place two banana halves on a sheet of foil and squeeze the juice from half a lemon and sprinkle them with brown sugar. Repeat this process with the remaining bananas.
Dot them with butter pieces.
Fold another piece of foil over each banana slice so it looks like a packet. Place each on a Coleman® Propane Grill Stove.
Cook for 15 minutes, or until the bananas are hot and the sugar is melted. Serve them warm.