1. Grate 1/2 teaspoon rind from orange.
2. Peel oranges and grapefruit. Cut out citrus sections over a bowl, reserving juice. Set fruit aside. Squeeze membranes over bowl to extract additional juice. Discard membranes.Combine 6 tablespoons juice, rind, oil, and next 4 ingredients; stir with a whisk. Cover and chill. Reserve remaining juice for another use.
3. Preheat broiler.
4. Rub jerk seasoning over fish. Place fish on a broiler pan coated with cooking spray. Broil 14 minutes or until fish flakes easily when tested with a fork. Flake into bite-sized pieces; cover and chill 30 minutes.
5. Combine fruit, spinach, and onion. Drizzle dressing over salad; toss.Divide salad evenly among 5 plates; top evenly with fish. Sprinkle with sunflower seeds.
carbo rating: 11