1. Preheat grill to high heat.
2. Combine minced parsley, lemon rind, garlic, 1/2 teaspoon salt, & 1/2 teaspoon black pepper in a small bowl. Sprinkle chicken with parsley mixture; let stand 10 minutes. Place chicken on grill rack coated with cooking spray; grill 3 minutes on each side or until chicken is done.
3. Combine juice, oil, mustard, remaining 1/4 teaspoon salt & 1/4 teaspoon pepper in a large bowl; stir with a whisk. Add lettuce and remaining ingredients; toss to coat.
For the Herbed Couscous: Bring 1 1/4 cups water to a boil in a small saucepan. Stir in 1 cup uncooked couscous; cover. Remove from heat; let stand 5 minutes. Stir in 2 tablespoons chopped fresh flat-leaf parsley, 1 tablespoon melted butter, 1 teaspoon minced garlic, 2 teaspoons fresh lemon juice, 1/4 teaspoon kosher salt & 1/4 teaspoon freshly ground black pepper.
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