Sumac comes from a berry and is popular in Mid East dishes. It adds a lot of flavor and if you can find it I recommend adding it. You can always order it thru Penzeys spices online.
May 17, 2006
i omitted the tomato and the sumac, so perhaps this review is not helpful to you. but i can say that this recipe minus the tomato and sumac makes very nice grilled kebabs. crispy dry and flavorful on the outside, and moist and tender on the inside. i imagine with the tomato paste the recipe is still good, and as for sumac, i can't comment since i don't know what it is. ps- i marinated for only 2 hours and cooked under a broiler and it was very good, longer marination and cooking on the bbq would probably make even better kebabs.