In a large pot, add water and cook orzo according to package directions until al dents; about 8-10 minutes.
Drain and toss with olive oil, butter, and season with small amount of salt and pepper. Set in refrigerator to cool.
Add all dressing ingredients into a medium bowl and whisk thoroughly to combine. Alternatively, you can add all the ingredients to a medium mason jar (or jar with lid), cover and shake thoroughly to combine.
Once the veggies are done being shopped and the orzo is cool, add all the veggies and orzo to a large bowl. Mix to combine and pour the dressing over top.
Toss again to combine and coat the entire salad with dressing. Taste and season with additional salt and pepper, if desired.