1. Cook orzo according to package directions, omitting salt and fat. Drain and rinse with cold water; drain and place in a large bowl.
2. While orzo cooks, combine lemon rind and next 6 ingredients (through black pepper), stirring well with a whisk. Drizzle juice mixture over orzo; toss to coat. Add chicken and next 4 ingredients (through dill); toss gently to combine. Sprinkle with cheese.