Cook the orzo 9 minutes in boiling water. Skip the salting of it as the dressing has plenty. Drain and rinse with cool water.
In a bowl, combine the orzo, corn, beans, tomatoes and green onions.
Whisk the dressing ingredients together. They also had some ground red pepper (1/4 tsp) but I didn't have any so left it out.
Pour the dressing onto the orzo, bean and corn mixture and toss together. Top with the avocados, parsley and cilantro.