One: In a large, shallow bowl, add chicken and 3 tbsp lemon juice. Turn to coat. Sprinkle 1/4 tsp salt, cayenne and 1/2 tsp black pepper on all sides of chicken, dividing evenly. Set aside.
Two: Place a ridged grill pan on medium-high heat and mist with cooking spray. Add chicken and grill, turning once, until cooked through, about 5 minutes per side. If necessary, work in batches to avoid overcrowding pan. Transfer to a cutting board and set aside until cool enough to handle, about 5 minutes. Cut each chicken breast crosswise into thin slices.
Three: Meanwhile, prepare dressing: In a small bowl, whisk remaining 1/4 cup of lemon juice, yogurt, oil, remaining 1/4 tsp salt and 1 tsp black pepper. Set aside.
Four: In a large bowl, toss spinach, onion, pomegranate and pistachios and divide among serving plates. Top with chicken and avocado and drizzle with dressing, dividing evenly. Serve immediately.
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