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What Are Pistachios? Pistachio is a dry fruit from the pistachio tree; a small tree with origins in the Middle East and Central Asia. The pistachio tree belongs to the cashew family. Their fruit is a drupe that contains an elongated seed; it is this seed that people eat. The seed is a culinary nut, rather than a botanical nut, and has a distinct flavour.
Shares & Saves. Save. Many people, who love pistachios, may remember the nuts as red years ago and perhaps thought that was the natural color of the pistachio. Now that pistachios are most often seen in their natural state of beige, we know the festive, red color was a dye-job all along.(NA/PhotoObjects.net/Getty Images).nother theory is that the red tradition was begun by a Syrian importer named Zaloom, who dyed his pistachios red in order to distinguish his from his competitor's. One more theory says that in the Middle East, the pistachios were left in their reddish outer husks and brined before roasting.