Layer a third of the sliced potatoes, overlapping slightly, to cover your dish.
Add a third of the onions, bacon and corned beef.
Repeat 2 more times, creating 3 layers in total.
Mix together the beef stock and gravy and pour over the top.
Crush the beef stock cubs and sprinkle over the top to help brown the potatoes. Add salt and pepper to season.
Cover and cook for 50 minutes at 180°C. Uncover and cook under grill for 10 additional minutes watching it carefully.
