Bring a large pot of water to a boil and cook pasta according to package directions.
While the water boils/pasta cooks, prepare other ingredients. Slice tomatoes and olives, roughly chop parsley and basil, and flake canned tuna with a fork. Set aside.
Mix all dressing ingredients into a small jar with a lid. Shake and adjust seasonings as desired.
Drain pasta and place in a large mixing bowl. Add all prepped ingredients along with a handful or two of baby arugula. Pour dressing over top, and toss everything well.
Serve pasta salad with freshly ground pepper and any other seasonings (as desired). Can be enjoyed immediately or kept in the fridge for later!