In very fine mesh strainer, thoroughly rinse quinoa with cold water; drain. Combine quinoa and 2 cups water in saucepan. Bring to a boil over high heat; reduce heat and simmer, covered, until water is absorbed and quinoa appears translucent (about 15 minutes); cool. Fluff with a fork. In large bowl, gently combine quinoa with next 5 ingredients. Whisk together juices, olive oil, salt, cumin and white pepper. Drizzle dressing over quinoa mixture; toss to combine. Refrigerate, covered, several hours, or overnight. Toss gently before serving.