Mongolian Beef is a flavorful Chinese dish that features tender strips of beef stir-fried with onions in a savory sauce. The beef is typically marinated in a mixture of soy sauce, ginger, and garlic, then cooked until it's perfectly tender. The sauce is made from a combination of soy sauce, hoisin sauce, and brown sugar, giving it a rich and slightly sweet flavor. Mongolian Beef is often served with steamed rice or noodles.