This salad offers pleasingly bitter red endive spears, licorice-sweet slices of fennel, and sections of orange and grapefruit. Rosemary, ginger, parsley, and hazelnut oil add complexity.
Toss endives, fennel, fruit, and parsley in a large bowl; set aside. Whisk rosemary, ginger, juices, vinegar, and salt in a large bowl. Whisking constantly, pour in the oils in a slow, steady stream. Pour dressing over salad to taste; toss. Serve.