For a convenient and easy way to enjoy Mongolian Beef, try making it in a slow cooker. This recipe involves marinating the beef in a flavorful sauce and then slow cooking it for several hours until it becomes tender and infused with the delicious flavors. The slow cooker method allows the beef to become incredibly tender and allows the flavors to meld together beautifully. Serve this Slow Cooker Mongolian Beef over steamed rice for a satisfying and comforting meal.