In a food processor, combine the onion, ground lamb, and a strong pinch of zaatar. Pulse until smooth
Form into your favorite size meatball (Make sure it's big enough to hold up well on your skewer)
Prepare your skewers by alternating between meatballs, peppers, and mushroom caps.
Spray with a bit of olive oil
Grill until cooked and add to your warmed naan that's been spread with labna and sumac sprinkles