Trim fat from steak and cut across the grain into 1cm slices.
Coat beef slices in cornflour and place them in the bowl of the slow cooker.
In a jug, combine grated ginger, crushed garlic, brown sugar, soy sauce, and vegetable oil.
Add 1/2 cup of water to the mixture and mix well.
Pour the sauce over the beef in the slow cooker.
Cook on high for 4 hours, stirring halfway through to ensure everything is coated well in the sauce.
Serve garnished with chopped shallots, with rice and steamed vegetables on the side.