Put lettuce, parsley, mint, olives and onions in a wide bowl. Meanwhile, crush garlic with a large knife, chop finely, add a pinch of salt and smash into a paste with a large knife. Add lemon juice, olive oil, zatar and garlic with a pinch of salt in a small bowl and whisk together to emulsify. Pour dressing over salad leaves and toss with your hands to coat evenly. Add pieces of toasted pita and lightly toss. Serve!