To do this, shred the leaves and add them to a pan with the leek or onion, oatmeal, salt, pepper and water.
Cook for around 20 minutes and all of the vegetables are soft, then take off the heat.
Now take a tub of around 1 litre capacity and brush with the oil.
Pour the pudding into the tub, cover, cool and then refrigerate.
First fry the bacon in your chosen frying fat or oil over a medium heat until very crisp.
As they cook, prepare the pudding: turn out onto a board and cut even slices between 1 and 1.5 cm thick.
Remove the bacon rashers and keep warm as you fry the pudding slices: turn up the heat to medium-high and pop in the slices.
Turn over with a spatula and fry the other side for a further 4 or 5 minutes.
When ready, serve up with the bacon and whatever other breakfast things you like.