Za’atar is a great mixture of spices used for Arabic dishes, such as Borek or Salads. It’s made of roasted sesame, cumin, sumach, marjoram, oregano, and salt.
I usually mix up a good amount of Za’atar and keep it in a little jar. When I use the spice for cooking, I blend the amount of Za’atar I need for the dish in a blender/mortar before I use it for the dishes. It brings out the flavor and combines all the spices and herbs perfectly. I would not recommend blending the whole mixture, as it gets mouldy after some weeks, while the mixture without blending will last for several months.