Spicy Chicken Shawarma

INGREDIENTS

• 2 tablespoons finely chopped fresh parsley
• 1/2 teaspoon salt
• 1/2 teaspoon crushed red pepper
• 1/4 teaspoon ground ginger
• 1/4 teaspoon ground cumin
• 1/8 teaspoon ground coriander
• 5 tablespoons plain low-fat Greek-style yogurt, divided
• 2 tablespoons fresh lemon juice, divided
• 3 garlic cloves, minced and divided
• 1 pound skinless, boneless chicken breast halves, thinly sliced
• 2 tablespoons extra-virgin olive oil
• 1 tablespoon tahini
• 4 (6-inch) pitas, halved
• 1/2 cup chopped cucumber
• 1/2 cup chopped plum tomato
• 1/4 cup prechopped red onion