How to Make It
Heat a grill pan over medium-high. Coat pan with cooking spray. Drizzle 1 1/2 teaspoons oil over fish; sprinkle evenly with 1/2 teaspoon salt and pepper. Add fish to pan; cook 5 minutes on each side or until fish flakes easily when tested with a fork.
Place potatoes in a microwave-safe bowl with 2 tablespoons water; cover and microwave at HIGH 2 minutes or until crisp-tender. Combine potatoes, 1 1/2 teaspoons oil, and remaining 1/4 teaspoon salt in a bowl; toss. Add potatoes to grill pan; cook 5 minutes on each side or until tender and grill marks appear. Place potatoes in a bowl.
Place remaining 3 tablespoons oil, green onions, parsley, and juice in a mini food processor; process until smooth. Add half of parsley mixture to potatoes; toss. Spoon remaining parsley mixture over fish.