Mongolian Beef is a flavorful Chinese dish that features tender strips of beef stir-fried with onions in a savory sauce. The beef is marinated in a mixture of soy sauce, ginger, and garlic, then cooked until it becomes tender and juicy. The sauce is made from a combination of soy sauce, hoisin sauce, and brown sugar, giving it a perfect balance of flavors. Serve it over steamed rice for a satisfying and delicious dinner.