In large bowl, whisk together olive oil, lemon juice, honey, salt, and pepper.
Add arugula and toss until coated. Lightly stir in Parmesan cheese or garnish salad with cheese.
Serve immediately.
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Notes
This salad is best served immediately once the ingredients are combined because the arugula wilts somewhat after it's dressed.
Make ahead: Prepare dressing, wash and dry arugula, and shave the Parmesan cheese up to a day ahead. Store components of the salad separately in the fridge and combine right before serving.