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Coltayin root was a type of plant lifeform-based food, a root vegetable known to the Iyaarans.
In 2370, Anna prepared coltayin roots for Captain Jean-Luc Picard, which she mixed with Terellian spices, (TNG episode: "Liaisons")
According to the Talaxian traveler Neelix, the closest equivalent to coltayin roots on Earth were yams. (ST reference: Star Trek Cookbook)