Grilled za'atar shrimp with herby yogurt

Za'atar is a flavor-packed Middle Eastern spice blend made from ground dried za'atar (a herb similar to oregano) along with tangy sumac, spices like thyme or coriander and sesame seeds (the blend varies from region to region, and cook to cook). In this recipe, it serves as the flavoring for a simple marinade used to coat shrimp that cook in a flash on the grill (or in a grill pan). Serve the shrimp on top of a bed of cool, lemony, herby yogurt for a quick and easy summer dinner that requires little of the cook.