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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.
The shell of the pistachio is naturally a beige color, but it is sometimes dyed red or green in commercial pistachios. Originally, dye was applied by importers to hide stains on the shells caused when the seeds were picked by hand.istachio trees can be found in regions of Iran, Syria, Lebanon, Turkey, Greece, Xinjiang (China), Tunisia, Kyrgyzstan, Tajikistan, Turkmenistan, India, Egypt, Italy (Sicily), Uzbekistan, Afghanistan (especially in the provinces of Samangan and Badghis), Australia and the United States, specifically in California.