Beef stir-fry is a flavorful and colorful dish that is packed with vegetables and tender strips of beef. Marinate the beef in a mixture of soy sauce, garlic, ginger, and sesame oil for added flavor. Stir-fry the beef and vegetables in a hot wok or skillet until they are cooked to your liking. Serve it over steamed rice or noodles for a quick and delicious dinner.