Pistachios may refer to any one of several tree species of the Pistacia genus. Which is part of the same family as cashews, mango and poison ivy food.
Still, Pistacia vera is the only tree that produces edible fruits. Which are commonly known as pistachios.
The pistachio is native to Western Asia and the Middle East. And evidence indicates that fruits of the tree have eaten for over 8,000 years.UFABET

Today, the largest producers of pistachios are Iran, the United States and Mediterranean countries .
Pistachio trees grow in dry climates and can reach up to 39 feet (12 meters) in height.
In the spring, the trees develop grape-like clusters of green colored fruits, known as drupes. Which gradually harden and turn red.
Within the fruit is a green and purple seed, which is the edible part of the fruit.
As the fruits ripen, the shell hardens and splits open. With a pop, exposing the seed within. The fruits are picked, hulled, dried, and often roast before being sold.
Because pistachios are the seed of a drupe. They are not a true botanical nut. However, in the culinary world, pistachios are treat as nuts, and they’re also classified as a tree nut allergen