What is "Mongolian beef"?

Mongolian beef is a popular Chinese-American dish that features sliced beef that has been stir-fried with a variety of ingredients such as onions, garlic, and scallions, and seasoned with a blend of sauces and spices. The beef is typically marinated in a mixture of soy sauce, rice wine, and cornstarch, which gives it a tender and juicy texture. The dish may also include ingredients such as ginger, bell peppers, and mushrooms, which are stir-fried with the beef and seasoned with a blend of sauces such as hoisin sauce, oyster sauce, and sesame oil. It can be customized to suit different tastes and dietary preferences, and is often served with steamed rice and vegetables.