Peel the potatoes and cut them as thinly as possible.
We use a mandoline slicer for this.
Soak them in water for half an hour and dry them thoroughly with a dish towel.
Cut them with whatever cutter you have to make them small, similar in size to the langoustine tails.
Place the oil in a bowl and dip the potato slices one by one in the oil, then lay them on a baking sheet with parchment paper.
Bake them at 180 degrees Celsius (356 degrees Fahrenheit) in a conventional oven for 5-7 minutes depending on the oven and the thickness of the potatoes.
They should take on a bit of color, but keep an eye on the edges.
Pat them with a dish towel when they come out and sprinkle salt on immediately.