1.8 kg of potatoes
Butter, duck fat or lard
Peel the potatoes & gradually place the peeled potatoes in a bowl of fresh water
Grate the potatoes (with a large-hole cheese grater)
Put a good tablespoon of (butter, lard or duck fat) in a small pan or two in a large one. Let it melt.
Then add the potatoes. You need a certain thickness for the cake to have cohesion.
Cook over moderate heat for 10 minutes with a lid. Press the potatoes with a spoon so that the juice comes out a little and gives cohesion. Flip Swiss apples like a pancake
Cook again on the other side, without a lid this time, until the entire pancake is nicely browned!