Leave to cool slightly. Carefully tip the potato mixture into an oven dish and try to make sure all the potato slices are flat in the tray. Cut a piece of parchment paper to size and place it on ...
While the dough is resting, peel and cut the potato, swede and onion into cubes about 1cm/½in square. Cut the beef into similar sized chunks. Put all four ingredients into a bowl and mix.