Orange Beef Stir Fry

Name: Orange Beef Stir Fry
Ingredients: 1 cup long-grain white rice; 1/4 cup freshly squeezed orange juice (from 1 orange); 1 tablespoon rice vinegar; 1 tablespoon soy sauce; 1 tablespoon light-brown sugar; 1 lb. top or bottom round steak cut into strips, 2 inches long and 1/4 inch thick; 1 tablespoon cornstarch; Coarse salt and ground pepper; 1 bunch (1 pound) broccoli florets broken into small pieces (reserve stalks for another use); 2 tablespoons vegetable oil; 1 red bell pepper (ribs and seeds removed), cut into strips, 2 inches long and 1/4 inch wide