What unusual foodstuffs do they cultivate in your worlds? I'll start, on one of my sci-fi worlds (not named yet, but it's a typical colony on an alien planet sort of deal) a modified variety of ginger has become a staple crop. The unmodified variety was one of the first things the colonists could get to grow in the alien soil. When efforts to adapt most Earth staples failed they instead re-engineered those plants they could grow to be more nutritious. The ginger was spliced with genes from many different vegetables but primarily yams. The resulting crop retained most of the original flavor but is starchier and a bit sweeter than traditional ginger, with a firmer, grainier texture than a yam or potato.