Cook orzo according to package directions, omitting salt and fat. Rinse and drain well.
Arrange broccoli in a steamer basket over boiling water. Cover and steam 3 minutes or until crisp-tender.
Combine mayonnaise and next 3 ingredients in a bowl, stirring well.
Combine orzo, broccoli, red pepper, and pesto mixture in a large bowl. Serve at room temperature.