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Preheat the oven to 425 degrees F or 220 degrees C.
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Scrub or peel the potatoes.
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Use a mandoline or the cucumber slicer on a cheese grater to slice the potatoes about 1/4 cm thick.
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Do not rinse.
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Use one third of the butter to grease a round cake tin on the bottom and the sides.
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Layer the potatoes in the dish, seasoning with salt and pepper and bits of butter as you go.
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Make sure to save some butter for the top.
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Cook for 30 minutes, then lower the heat to 400 degrees F or 200 degrees C and cook for another 15-30 minutes.
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When the top slices are crisp and golden brown test to see if the middle feels tender when pierced with a knife.
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When the potatoes are cooked, run a knife around the inside of the pan to ensure the potatoes aren't stuck anywhere.
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Place a plate over the cake tin and quickly invert.
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To make a garnish, finely chop the garlic and parsley.
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Mix together, sprinkle over the hot potato cake and serve.