1. Trim fat from beef steak. Cut steak lengthwise in half and then crosswise into 1/4-inch thick strips; set aside.
2. In medium saucepan, bring beef broth to a boil. Stir in couscous; cover pan and remove from heat.
3. In large nonstick skillet, heat oil over medium-high heat until hot. Add beef, 1/2 at a time, and stir-fry 1 to 2 minutes or until outside surface is no longer pink. Remove from skillet with slotted spoon; keep warm.
4. In same skillet, stir-fry bell pepper and onion 2 to 3 minutes or until crisp-tender. Return beef to skillet; stir in barbecue sauce. Cook and stir 1 to 2 minutes or until heated through. Arrange beef mixture on couscous; sprinkle with chopped parsley. Garnish with parsley sprigs.