In a small bowl, combine the ranch dressing with the salsa and orange zest. Lay the tortillas on a cutting board, and spread the ranch mixture evenly over each one, leaving about a 1-inch border on all sides. Layer the turkey, avocado, lettuce, jicama, tomato, and scallions evenly over each tortilla, still leaving a border. Season with salt and pepper. Roll up like a pinwheel. Halve, and serve.
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