Grain
From Memory Alpha, the free Star Trek reference.
Grain is a small, dry fruit of a cereal grass containing a single seed. It is typically used as ingredients in other dishes such as bread. Such cereal grasses have evolved and harvested on such planets as Earth and Bajor, along with many others, such as Sherman's Planet. (DS9: "Dramatis Personae"; TOS: "The Trouble with Tribbles"; TAS: "More Tribbles, More Troubles")
