Black Pepper Beef Stir Fry is a flavorful and easy-to-make Chinese dish that is made using thinly sliced beef that is stir-fried with a variety of vegetables, such as bell peppers, onions, and mushrooms. The dish is then seasoned with a spicy black pepper sauce that is made using soy sauce, oyster sauce, and black pepper. The dish is perfect for a quick and easy weeknight meal that is packed with flavor.