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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.
It was mentioned in a 6th century European Food Book as a culinary nut. The tree was introduced into the United Sates in 1904 in the state of California and became a commercial crop in 1929. The Pistachio tree grows up to 30 feet (10 meters) tall. It is a deciduous tree that sheds its leaves in winter.