How to Make It
Bring 4 cups water, wine, 1 teaspoon salt, garlic, and tarragon sprigs to a boil in a large saucepan. Cover; reduce heat, and simmer 10 minutes. Reduce heat to low, add tuna, and poach for 10 minutes. Remove from heat; let stand 10 minutes. Place tuna on a plate; chill.
Combine shallots, thyme, juice, and Dijon in a large bowl, stirring with a whisk. Drizzle in oil, stirring with a whisk. Place half of vinaigrette in a medium bowl.
Flake tuna into large chunks. Add tuna to medium bowl; toss very gently to coat. Place kale, remaining 1/2 teaspoon salt, and remaining ingredients in large bowl with remaining vinaigrette; toss. Divide salad among 4 plates; top with tuna.
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.