Zereshk
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Zereshk (زرشک) is the Persian name for the dried fruit of barberries [1], which are widely cultivated in Iran. Iran is the largest producer of zereshk and saffron in the world. Zereshk is the fruit of a type of barberry bush. Zereshk and saffron are produced on the same land and the harvest is at the same time. The southern part of Khorasan is the main area of zereshk production. A garden of zereshk is called zereshk e- stan. It has a sour taste and is often used in dishes involving chicken. It is usually cooked with rice and provides a nice meal with chicken. Zereshk jam is also produced in Iran.
In colloquial Persian, zereshk is used as a term for showing dissent or disagreement, similar the to usage of "raspberry" in English. Although not a vulgar term in that context, it is not used in polite speech.