DRESSING
SALAD
CHICKEN
Prepare a grill for medium-high heat; heat 5 minutes (or preheat a grill pan over medium-high heat). Place chicken between 2 pieces of plastic wrap and pound with a meat mallet into ½"-thick pieces. Season chicken all over with lemon pepper and ¾ teaspoon salt.
Grill chicken, turning halfway through, until golden brown and just cooked through, about 5 minutes per side. Transfer to a cutting board and let cool slightly.
In a medium bowl, whisk vinegar, orange zest, orange juice, mustard, poppy seeds, granulated sugar, dried onions, and ½ teaspoon salt. Slowly stream in oil, whisking constantly, until dressing is smooth and emulsified.
In a large bowl, toss romaine with one-third of dressing; season with salt. Thinly slice chicken against the grain and arrange over lettuce. Top with oranges, pineapple, strawberries, blueberries, and pecans. Serve with remaining dressing alongside.
