In a large bowl combine chicken, orange sections and peas. In a small bowl combine mayonnaise, orange juice and orange zest. Add to chicken mixture; stir to coat.
Gently open the pockets of each pita half. Place chicken mixture evenly into each pocket. Add lettuce, if desired, and serve.
Nutrients per serving: 190 calories, 2.5g fat, 0.5g saturated fat, 35mg cholesterol, 330mg sodium, 27g carbohydrate, 4g fiber, 7g sugars, 16g protein, 4 percent vitamin A, 40 percent vitamin C, 2 percent calcium, 8 percent iron