Tandoori chicken with yogurt sauce

Ingredients

• 1 cup plain low-fat yogurt, divided
• 2 garlic cloves, minced
• 1 teaspoon ground turmeric
• 1 teaspoon ground ginger
• 1 teaspoon salt
• 1/4 teaspoon pepper
• 4 bone-in chicken breasts halves
• 1 Granny Smith apple
• 1 tablespoon chopped fresh cilantro