Combine the lime juice, garlic and chipotle chile in a medium nonreactive bowl; season with salt. Add the chicken, toss well to coat, and refrigerate 2 hours. Remove the chicken from the marinade; thread onto 4 (12-inch) skewers lightly misted with cooking spray.

Preheat the grill to medium. Mist the tortillas with cooking spray. Add the tortillas to the grill; cook, turning once, until lightly toasted, about 1 to 2 minutes per tortilla.

Meanwhile, add the chicken and the whole tomatillos to the grill; cook, turning often, until tomatillos are charred and chicken is cooked through, 4 to 6 minutes. Remove the skewers from the chicken.

Coarsely chop the tomatillos and toss with oil and salt to taste. Place toasted tortillas on plates; generously top with romaine, tomatillos, chicken, and queso fresco. Serve with onion, cilantro sprigs, and a lime wedge if desired.

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Nutritional analysis per serving (without optional onions, cilantro and lime wedges)

Calories 365.5; Total Fat 11g (Sat Fat 2.6g, Mono Fat 5.1g, Poly Fat 2g) ; Protein 33g; Carb 34g; Fiber 4g; Cholesterol 70mg; Sodium 517mg