Classic Mongolian Beef is a popular Chinese dish that features tender strips of beef stir-fried with green onions and a savory sauce. The beef is typically marinated in a mixture of soy sauce, hoisin sauce, and cornstarch to give it a rich and flavorful coating. It is then quickly cooked in a hot wok until it is tender and the sauce has thickened. This dish is often served over steamed rice and garnished with sesame seeds for added texture and flavor.