Mix together the arugula, almonds, celery and cucumber. Set aside while you make the dressing.
Whisk together the mustard, cocoa powder, balsamic and olive oil. Drizzle the salad with enough dressing to coat. Toss well together. Serve in individual bowls and garnish with shaved Parmesan.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.