Sumac: a Middle-Eastern ground spice that comes from a berry which grows on a wild bush around many parts of the Mediterranean and Middle-East, in particular, in Iran where it is widely used as a condiment alongside salt and pepper.
It goes very well with vegetables, cheese, chicken, lamb and fish. It can be used in rubs or marinades, added to a salad or stew or sprinkled over roast meats and fish at the end of cooking. I love to coat halloumi in it before frying or grilling it. Try sprinkling some on your houmous too!