Wash the potatoes and cut them, with skin, into slices of 4mm. Place them in a saucepan and pour vinegar over them with a generous pinch of salt. Then cover them just with water. Bring to a boil and then cook for 8 minutes, drain, place them on a towel and pat dry.
Lay them open on a baking sheet lined with parchment paper, nicely next to each other. Brush each slice with oil and sprinkle with salt. Bake them for 20 to 25 minutes in a preheated oven at 190°C or longer until they are beautifully golden brown.
Sprinkle generously with fleur de sel and freshly ground pepper. Serve immediately.
You can also make them in advance and reheat just before serving.
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