1. Heat a large skillet over medium-high heat. Add 1 1/2 teaspoons oil to pan; swirl to coat. Sprinkle shrimp with 1/4 teaspoon salt and 1/8 teaspoon pepper. Add shrimp to pan; cook 3 minutes or until shrimp are done, stirring frequently. Remove from pan; keep warm.
2. Peel and section grapefruit over a bowl, reserving 3 tablespoons juice. Combine grapefruit juice, remaining 2 tablespoons oil, remaining 1/4 teaspoon salt, remaining 1/8 teaspoon pepper, tarragon, brown sugar, and shallots in a large bowl, stirring well with a whisk. Add lettuce; toss. Arrange 2 cups lettuce mixture on each of 4 plates. Top each serving with 3 avocado wedges; divide shrimp and grapefruit sections evenly among servings.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.