Slow Cooker Mongolian Beef is a convenient and easy way to enjoy this delicious dish without much effort. In this recipe, the beef is marinated in a mixture of soy sauce, brown sugar, garlic, and ginger, and then cooked in a slow cooker for several hours. The result is tender and flavorful beef that is infused with the sweet and savory sauce. This recipe is perfect for busy days when you want a delicious meal waiting for you at the end of the day.