Place onion, parsley, mint, oregano and garlic in bowl of food processor. Pulse until minced. In large bowl, combine herb mixture, lemon pepper, salt, paprika and cumin. Add lamb; mix lightly but thoroughly. With wet hands, shape into 16 balls. In a large skillet, heat 1 tablespoon oil over medium heat. Brown meatballs in batches; drain. Remove and keep warm. Serve meatballs over cooked couscous. Top with yogurt, tomato wedges, and red onion. Garnish with mint leaves and lemon wedges.