Tart, green, and a little toasty, with sesame and a lemony tang from sumac: za'atar is the Middle Eastern herb blend you will want on almost anything savory. Brush flatbread or pita with olive oil, scatter it on, and bake for the classic za'atar flatbread (manoush). Beyond that, stir it into olive oil as a dip, spoon it over strained yogu...
