For me one of the best parts of travel is experiencing how and what other cultures eat. When I’m away from home, I try not only to eat like the locals but also to pick up the ingredients needed to cook like them. By the end of a trip I’ve invariably weighed down my bag with hastily jotted recipes, odd cooking pots, rare spices and exotic edibles. Out of the countless things that I’ve dragged through U.S. customs, the warm, zesty zahtar (also spelled za’atar or zaatar) remains a particular favorite. Originating in the Middle East, zahtar is an aromatic herb and spice blend. Its name likely comes from the Arabic word for wild thyme, zaatar. In fact, dried thyme is one of the main ingredients. Ground sumac, sesame seeds and sometimes dried marjoram likewise appear in this seasoning. People use zahtar to spice up an array of foods. Some cooks sprinkle it over labneh, a strained yogurt from the Middle East. Others mix zahtar with olive oil and slather this over breads. Then there …