Step 1: Peel and cut potatoes into scallop shapes (round discs). Slice corned beef and onion.
Step 2: layer ingredients as follows: potatoes, cornedbeef, onion, making three layers.
Step 3: make gravy using granuals. Pour gravy over hotpot, it should soak through to the other layers. Brush some butter or oil on the top layer.
Step 4: place in oven on the middle shelf, on a medium heat for atleast an hour and a half.