Entered for ZWT, from Australian chef Neil Perry, "Fresh and Fast". This version of the Lebanese dish uses mint, Italian parsley and cilantro (fresh coriander) instead of romaine or other lettuces. Sumac comes in berry or ground form; the berries last longer. Sumac has a sour, tart (lemony) and salty taste; (it is an important ingredient in Za'atar seasoning mixture). There is no good substitute for sumac; it is available through mail-order or at Middle Eastern grocers.