1. While beef is still partially frozen, trim away excess fat and slice thinly. 2. Whisk together marinade and pour over beef in a ziplock bag; refrigerate several hours or overnight. 3. Whisk together sauce in a small bowl and keep nearby. 4. Heat oil in a wok over high heat, stir-fry beef with marinade, mushrooms and onions until cooked through. 5. Add sauce to wok, and cook, stirring, until sauce thickens. 6. Serve stir-fry with steamed rice if desired. ---------------------------------------------------------------------------
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Ingredients