Mix together the quinoa, 1 tablespoon of olive oil, juice from half of the lemon, cilantro and the Za'atar seasoning if you are using it. Chill for at least 15 minutes. Spoon into the bottom of a medium sized, rimmed bowl. Arrange the warm falafel, chopped tomato, cucumber, onions, feta and olives on top. Whisk together the juice from the other half of the lemon, the tablespoon of olive oil and tahini. Drizzle the dressing on top and enjoy.
