Across North Africa, the Middle East and the Mediterranean, the Sumac spice is a necessary fourth seasoning in the kitchen, used as often like you would use salt. Sumac comes from a shrub in the Middle East, and its aroma hints of lime and lemon tints. It is mildly sour, the taste akin to unripe mangoes. It pairs well with all kinds of dishes from chicken, fish, to vegetables and hummus. Use sumac to flavor soups (such as sinigang), marinades and rubs.