Place beef steak on grid over medium, ash-covered coals. Grill, covered, 11 to 15 minutes (over medium heat on preheated gas grill, 13 to 16 minutes) for medium rare (145°F) to medium (160°F) doneness, turning occasionally.
Meanwhile, whisk all Dressing ingredients in medium bowl until smooth; set aside. Arrange lettuce on serving platter; arrange mango, avocado, carrot and bell pepper over lettuce.
Carve steak into slices; season with salt. Arrange beef over salad. Drizzle with dressing. Sprinkle with peanuts, if desired. Serve immediately; squeeze lime wedges over salad, as desired.
Nutrition information per serving: 356 Calories; 126 kcal Calories from fat; 14 g Total Fat; 3 g Saturated Fat; 6 g Monounsaturated Fat; 63 mg Cholesterol; 341 mg Sodium; 30 g Total Carbohydrate; 4.2 g Dietary Fiber; 30 g Protein; 3.4 mg Iron; 11 mg Niacin; 0.6 mg Vitamin B6; 2.9 mcg Vitamin B12; 7.6 mg Zinc; 26.8 mcg Selenium;