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Sumac is a very popular spice in Middle Eastern and certain Mediterranean cuisines. The berries of the Sumac bush are dried then ground to form a deep red, almost purplish coarse powder.

It is sour, tangy, lemony with just a hint of pepper. You could have lots of fun using it in your kitchen in place of lemon juice, tamarind and even vinegar.
Substitute: lemon juice and zest.
Lots of recipes on this site use sumac, like:
Lavender and Sumac Roast Chicken
Coban Salatasi (Turkish Shepherd Salad)