Orange Salad with Fennel and Onion

Peel the oranges with a sharp knife, then rinse and thinly slice. Arrange the orange slices on 4 plates. Rinse and wipe the fennel. Reserve the fronds, and finely dice the rest. Peel, halve, and julienne the onion. Chop the fennel fronds, and combine with the fennel and onion. Sprinkle the mixture over the orange slices. Finely chop the rosemary, and sprinkle over the salad. Season the salad with salt and pepper. Mix the vinegar with the honey and oil, then drizzle over the salad. Garnish with the olives and rosemary sprigs, then serve.