Top Sirloin Stir-Fry

In a small bowl combine cornstarch and broth, stirring until cornstarch is dissolved.  Stir in lemon peel and lemon juice; set aside. 

In a large non-stick skillet, heat 2 teaspoons sesame oil over medium-high heat.  Season sliced steak with salt and pepper.  Add beef to skillet and stir-fry until just brown, about 3 minutes.  Remove beef to plate; set aside.  

Add remaining 2 teaspoons oil to skillet. Add vegetables, garlic and ginger; stir-fry until bright in color and just beginning to soften, about 3 minutes. Stir broth mixture quickly to re-blend; add broth mixture and beef back into skillet. Cook until sauce thickens and vegetables are crisp-tender, stirring frequently, about 5 minutes. Sprinkle with cilantro. Serve with cooked brown rice, if desired.