Zaatar

n. zatar, zahatar, mixture of spices made-up of wild oregano and toasted sesame seeds (very popular in the Middle East)

Za'atar (Arabic زعتر , Hebrew זעתר, Armenian զահթար) is a popular mixture of spices that originated in the Middle East. The Arabic term za'atar does not specifically mean a spice mixture, but may refer to any of various local herbs of the mint family, including marjoram, oregano and thyme. Like most English words from Semitic languages, there exist alternate spellings: zaatar, zatar, zattar or zahatar.
See more at Wikipedia.org...

An herb mixture composed of savory, thyme, sumac, and sesame seeds. A prepared mixture of this herb mixture can be found at most Middle Eastern groceries. However, be aware that the quality of zaatar can differ greatly.