Combine celery, arugula, parsley, and chopped celery leaves in a medium bowl. Combine lemon juice, olive oil, freshly ground black pepper, and kosher salt in a small bowl, stirring well with a whisk. Drizzle juice mixture over celery mixture, and toss. Top with shaved fresh Parmigiano-Reggiano cheese.
This was a little difficult for my family - one person doesn't like arugula, one person doesn't like parsley, and one person doesn't like celery too much. DD wouldn't eat it at all. I think if I used romaine, it might be a bigger hit. But I didn't want to change it up without trying it as written. I can see how people would really enjoy it - it is fresh and crunchy and very easy to put together.
I made this for myself after a carb-heavy weekend. It was light, refreshing crunchy and tasty, everything I needed after heavier foods. Very delicious. You can read my full review at Taking On Magazines: http://bit.ly/16cE3CD