Boil 300 grams of peeled potatoes until soft and mash them.
In the meantime peel and blend or geate the rest of potatoes to a fine consistency..Put the raw potato into a tea towel and press out the juices,put the juice aside
Saute the slices shallot until slightly caramelised.
Fry up the bacon lardons if using
Add both the potatoes , mashed and very fine grated ( i use blender) and the onions,the bacon if using, the flours, and salt and pepper together and mix well.
If to dry add a little of the starchy potato liquid .
Put the dough into a greased ovenproof dish
Top with the bread .
Mix the milk and the egg and pour this over the top of the bread
Bake in oven on middle setting for about an hour or until bread is golden brown
Sprinkle over the wild garlic if yiu like .You can eat this hot or cold .
Serve instead of plain boiled potatoes cut into tennis ball size.