In a small to medium saucepan, add 1? cups water and quinoa. Bring to a boil, reduce to simmer, cover and simmer 15 minutes or until water is absorbed. Remove from heat and let sit a few minutes then fluff with fork. Set aside.In a liquid measuring cup or small bowl whisk all ingredients until well combined.In a large bowl add cooked quinoa, all ingredients except arugula and ½ the dressing. Toss to combine. Add more dressing as desired.Toss in arugula when ready to serve.Serve cold or room temperature. Stores well in the refrigerator for several days in a sealed container (especially if you don't add the arugula until ready to eat.