Regularly used in Lebanon and in the Middle East, sumac is a fine red powder that comes from the crushed grain of the tree of the same name. Lightly sour, sumac is incredibly versatile. It can be used instead of lemon to season fish, seafood and chicken. It is a defining ingredient in that most Lebanese of salads, fattoush, and is often used in other salads too. This spice can perfume your rice and bread, or, mixed with yogurt and fine herbs, it becomes an exquisite dip or side sauce.