Sumac is used widely in cookery in Arabia, Turkey and the Levant, and especially in Lebanese cuisine. In these areas it is a major souring agent, used where other regions would employ lemon, tamarind or vinegar. It is rubbed on to kebabs before grilling and may be used in this way with fish or chicken. A mixture of yogurt and sumac is often served with kebabs and a sprinkle to seasona salad. Somaq is a tangy, lemony spice often used in Mediterranean and Middle Eastern cooking. Try using it in salads instead of lemon juice or to season grilled meat and fish. It’s also delicious sprinkled over hummus.