Make dressing by combining the orange juice, mustard, oregano and honey in a small bowl. Slowly whisk in the oil; season with salt and pepper. Mound the lettuce on 6 salad plates. Artfully top with the cheese, oranges, onion and nuts. Drizzle the salad with the dressing and serve.
Recipe Options: Instead of butter lettuce, use leaf lettuce as the base for this salad. For a tangier taste, use half slices of peeled grapefruit in this salad. Instead of feta cheese, top the salad with nuggets of soft goat cheese.