Combine rind, 1 tablespoon juice, garlic, oil, salt, and pepper. Toss with bell pepper, tomatoes, chicken, and onion. Thread vegetables and chicken onto 4 (12-inch) skewers. Place skewers on a broiler pan coated with cooking spray. Broil 12 minutes or until chicken is done, turning occasionally.
Combine 1 teaspoon juice, yogurt, sour cream, and pesto. Serve sauce with kebabs.