Patrick Sherwin was decommissioning a solar hot water system on someone’s roof when he had a crazy idea.

Picking up one of the vaccuum tubes used to insulate and heat the water, he thought, “I wonder if I could cook a bunch of hot dogs in this thing?”

Ten years later, Patrick’s startup, GoSunStove, is cranking out the world’s most efficient solar cooker. Not only does the SunStove make tailgating cool as anything, it’s also a potential lifesaver around the globe, where accidental smoke inhalation from indoor cooking with dirty fuels is the second leading cause of death worldwide.