http://www.wired.com/2014/06/potato-bean/

Cannon isn’t trying to re-create the past, though. He’s inventing the future. On this fall afternoon, his team is harvesting tubers that resemble dark-skinned fingerling potatoes. They’re called Apios americana, the potato bean—a legume endemic to North America. Native Americans gathered them and may even have served them at the first Thanksgiving. European settlers found them thriving in their cranberry bogs—places with low light, few nutrients, and bad soil. But they didn’t bother domesticating them into an agricultural staple.