BaseCamp stove and PizzaDome, available at BioLite, for $309.85
Okay, so maybe it's a bit cumbersome for a true trek, but a short hike to a campsite with this handy little kit will have them cooking, baking, or firing off pizzas just about anywhere they so please. The heat this thing generates also charges a battery, which can then power anything that runs through a USB port. Far out, indeed.