Raw Fennel and Red Onion Salad

Name: Raw Fennel and Red Onion Salad
Prep time: 15 min
Total time: 15 min
Yield: 4 serving(s)
Ingredients: 3 fennel bulbs, trimmed, cored, and sliced thinly (with mandoline); 1 large red onion, thinly sliced; 1/4 cup extra virgin olive oil; 6 tablespoons fresh lemon juice (from ~1 1/2 lemons); 2 teaspoons balsamic vinegar; 2 teaspoons Dijon mustard; 1/2 teaspoon kosher salt; 1/2 teaspoon black pepper; 1 large bunch arugula, well washed, dried, and torn into bite-size pieces; shaved parmesan cheese (to garnish)