Beef stir-fry is a quick and easy recipe that is packed with flavor. Thinly sliced beef is cooked with a variety of vegetables in a savory sauce. The key to a successful stir-fry is to cook the ingredients quickly over high heat to retain their crispness and color. Serve it over steamed rice or noodles for a complete meal. This dish is perfect for busy weeknights when you want a healthy and delicious dinner.