The Zereshk (زرشک) is the Persian name for the dried fruit of Barberry ( Berberis vulgaris ), which are widely cultivated in Iran. Barberry and saffron are produced on the same land and the harvest is done at the same season.
The South Khorasan province in Iran is the main area of Barberry and Saffron production in the world. Barberry cultivation in Iran is concentrated there, especially around Birjand and Qaenat. about 85% of production is in Qaenat and about 15% in Birjand. According to evidence the cultivation of seedless barberry in South Khorasan goes back to two hundred years ago. Barberry is widely used in cooking, imparting a tart flavor to chicken dishes. It is usually cooked with rice, and provides a nice meal with chicken. Barberry jam, Barberry juice are also produced.