1Mix 1 tablespoon lime juice, jerk seasoning, steak sauce, 2 teaspoons honey and oil in a shallow dish. Add chicken and turn to coat. Cover and marinate in the refrigerator for 20 minutes.
2Meanwhile, preheat grill to medium-high or preheat broiler.
3Stir together nectarines, scallions, remaining 3 tablespoons lime juice and remaining 2 teaspoons honey in a small bowl. Season with salt and pepper.
4Oil grill rack or broiler pan. Grill chicken until no longer pink in the center, 3 to 4 minutes per side. (Alternatively, place thighs on broiler pan. Broil 4 to 6 inches from heat, 4 to 5 minutes per side.) Transfer chicken to a cutting board. Let stand for 5 minutes, then slice diagonally.
5Toss romaine with nectarine mixture in a large bowl. Divide among 6 plates and arrange chicken on top. Serve immediately.
Ingredient note: Jerk seasoning is a dry rub available in the spice section of most supermarkets.