Cook the farro: Follow the instructions for cooking your farro found on its package. Once it is cooked, drain off any excess liquid, and set the farro aside to cool to room temperature.
Make the salad dressing while the farro is cooling off by whisking all of the salad dressing ingredients in a small mixing bowl.
Make and toss the salad: Add the arugula, farro, cucumber, tomato, and olives to a large mixing bowl. Pour ¾ of the salad dressing into the bowl and toss everything together. Taste the salad and add more dressing if you feel like it needs it along with some salt & pepper to taste.
Serve the farro & arugula salad immediately and enjoy!