Clean the anchovies. Holding the head with two fingers, detach it at the gills, pulling it toward you. Then extract the entrails with your finger. Gently open the anchovies like a book and remove the backbone. Wash them under cold running water and dry them by laying flat and dabbing them with a paper towel.
Peel and cut the potatoes into thin slices.
Oil a round pan and sprinkle the bottom with breadcrumbs.
Arrange a bed of squeezed potatoes on top so that a flat base forms.
Add the anchovies, salt and pepperon top. Note: the anchovies can be arranged with the tails outwards, or they can be put without a tail. It depends on your personal taste.
Then, beat the eggs in a bowl with the Parmesan, milk, marjoram (or oregano), salt and pepper, and pour the mixture over the anchovies.
Bake at 350 °F for 30 minutes, or until the pie is golden brown.