1
For the pomme purée: preheat your oven to 200°C. Line a baking tray generously with rock salt, place the potatoes on it and bake for 50 minutes to 1 hour, until the skin is crisp and the inside is soft throughout.
2
Remove the potato pulp and pass it through a ricer. Warm the milk and stir it in, then emulsify in the cold butter bit by bit until you have a smooth purée. Season with salt.
3
For the pomme fondant: preheat the oven to 190°C. Peel the potatoes and use a paring knife to cut them into cylinders.
4
Place a non-stick frying pan over a medium heat with a little oil. Fry the potatoes on each side for a few minutes until golden, then add the butter, stock, garlic and thyme.
5
Place the pan in the oven for 20 minutes until tender, basting occasionally. Then return the pan to a medium heat and spoon the cooking liquor over the potatoes until nicely glazed. Serve with a little of the liquor spooned over.
6
For the pomme Anna: preheat your oven to 190°C. Peel the potatoes and slice thinly on a mandoline.
7
Brush a 20cm cast-iron pan with melted butter and layer in the potatoes, brushing each layer with butter and seasoning with thyme leaves and salt. Build the layers until nearly at the top.
8
For the final layer, cut circles from a few slices with a cookie cutter and arrange in overlapping concentric circles. Finish with a final coat of butter and a sprinkle of salt.
9
Cook in the preheated oven for 45 minutes, basting occasionally, until the potatoes are tender and the top is golden brown and crispy.