Place flat iron steak in container and add 1 cup Florida Citrus Balsamic Vinaigrette. Marinate and refrigerated for at least 30 minutes or up to 3 hours.
Grill steak over medium-high heat to desired doneness. Remove from heat and allow to rest for 5 minutes. While steak is resting, prepare salad.
Combine Florida orange and grapefruit segments, baby spinach, red onion, cherry tomatoes, radish and cucumber in large mixing bowl. Add Florida Citrus Balsamic Vinaigrette, as desired, and toss well to combine.
To serve, divide salad among 4 plates. Slice flatiron steak into thin slices. Divide steak among the 4 plates, laying on top of salad. Top with crumbled goat cheese.