I learned this from a New Zealander I used to do Whitewater with: Chocolate and Marshmallow Stuffed BBQ Banana Recipe. I don't like marshmallows, but this looks really good. Also, the person before said something about a New Zealander.
Looks like a Great idea for the Teachworth Summer Camping Trip! Campfire Cones filled with marshmallows, chocholate, bananas and so much more. You'll love this treat. (Fun & Easy, Oh So Yummy Summer Dessert)