1. Preheat grill to medium-high heat.
2. Brush 1 tablespoon olive oil evenly over both sides of pork, and sprinkle evenly with 1/2 teaspoon salt and black pepper. Place pork on a grill rack coated with cooking spray, and grill 4 minutes on each side or until desired degree of doneness. Let pork stand for 5 minutes.
3. Place couscous in a large bowl. Add 3/4 cup boiling water; cover and let stand for 5 minutes. Uncover and fluff with a fork. Stir in remaining 2 tablespoons oil, remaining 1/2 teaspoon salt, cherries, and remaining ingredients. Serve with pork.