- 1/2 cup hazelnuts
- 4 tangerines
- 2 tablespoons sherry vinegar
- 1 tablespoon white balsamic vinegar
- 1 1/2 teaspoons honey
- 1 small shallot, minced
- 1/4 teaspoon fresh chopped thyme
- 1/4 cup extra-virgin olive oil
- 2 tablespoons hazelnut oil
- 1/4 teaspoon truffle oil (optional)
- Salt and freshly ground pepper
- 3 bunches watercress, thick stems removed
- 1 3/4 cups loosely packed flat-leaf parsley leaves
- 3/4 pound thinly sliced prosciutto, preferably duck prosciutto
- Preheat the oven to 350 degrees F. Spread the hazelnuts in a pie plate and toast for about 10 minutes, or until fragrant. Let the nuts cool slightly, then coarsely chop.
- Meanwhile, peel the tangerines, removing all the bitter white pith; if using oranges, peel with a sharp knife. Working over a large bowl, cut in between the membranes to release the citrus sections.
- In a bowl, whisk the sherry vinegar with the balsamic vinegar, honey, shallot and thyme. Whisk in the olive oil, hazelnut oil and truffle oil in a slow stream. Season the dressing with salt and pepper.
- Add the watercress and parsley to the tangerine sections and toss. Add 1/3 cup of the dressing and toss well. Arrange the salad on a large platter; arrange the prosciutto decoratively around the salad. Sprinkle with the toasted hazelnuts and serve with the remaining dressing.