For Dressing. Whisk yogurt, green onion, lemon juice and poppy seeds together to blend. Set aside.
For Salad: Rub both sides of turkey fillets with olive oil. Sprinkle generously with seasoning. Let stand 5 minutes. Place turkey on greased grill over medium heat. Cover and grill 8-12 minutes turning halfway through until internal temperature reaches 165°F (74°C). Combine peach and plum slices with lemon juice tossing gently to coat.Assembly: Divide greens on serving plates. Slice turkey and arrange over greens with fruit. Drizzle with dressing.