Pour the sesame seeds into a small frying pan over medium heat. Shake the pan back and forth as the seeds are toasting. After about 5 minutes, they should be lightly browned.
Place the toasted seeds into a small spice or coffee grinder, and grind them into a powder.
In a small bowl, combine the ground sesame seeds with the sumac, marjoram, oregano, thyme, and salt. Store in a small jar with a lid for up to 1 year.