How to Make It
Combine grapefruit sections and shrimp in a medium bowl, and set aside. In a small bowl, whisk together grapefruit juice, oil, salt, pepper, and sugar.
Place the lettuce in a large bowl, and drizzle with dressing, tossing gently to coat; divide among 4 plates. Divide shrimp mixture, avocado, and chives among salads.