Step 1

Toss arugula and cilantro together in a large salad bowl. Drizzle arugula mixture with lemon juice, olive oil, and balsamic vinegar. Sprinkle with red pepper flakes and black pepper; toss salad again. If desired, add more lemon juice, olive oil, balsamic vinegar, red pepper flakes, and black pepper to taste.

Step 2

Sprinkle salad with Parmesan cheese shavings and toss again to serve.