How to Make It
Preheat the grill or grill pan to medium-high heat.
Sprinkle steak evenly with 1/4 teaspoon salt, 1/4 teaspoon garlic powder, and 1/4 teaspoon pepper. Place steak on grill rack coated with cooking spray; grill 10 minutes or until desired degree of doneness, turning after 6 minutes. Let stand 5 minutes. Cut steak diagonally into thin slices.
Place shredded cucumber in paper towels; gently squeeze to release moisture. Stir cucumber, remaining 1/4 teaspoon salt, remaining 1/4 teaspoon garlic powder, and remaining 1/4 teaspoon pepper into yogurt.
Combine onion, dill, oil, and juice in a bowl; toss to coat.
Divide steak evenly among flatbread pockets; top each with about 2 tablespoons yogurt mixture, 1/4 cup onion mixture, and 1 halved tomato slice.
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.