Meet the GoSun Solar Dogger: a solar hot dog roaster that lets you prepare meals outdoors as long as there is sunlight. It has a vacuum tube that acts as an insulator and disperses heat to your food evenly. The Solar Dogger cooks your meals in 20 minutes, reaching temperatures up to 550F. It even works in cloudy conditions.
You don’t need any fuel to get started. The cooker folds into a slim package when you are done. More info is available here.