
Few dishes are as quietly showstopping as this classic French potato cake, and the beauty is that it's built entirely from pantry-simple ingredients — potatoes, butter, thyme, and salt. Every element is naturally free of wheat and gluten, so there's no substituting or second-guessing; the recipe just works as written. The real technique here is the clarified butter, which gives each layer a rich, nutty depth while helping the whole cake hold together and develop that deeply golden crust on the bottom. Slicing the potatoes thin and skipping the rinse step lets the natural starch act as the glue, so the layers fuse into something that slices cleanly and looks genuinely impressive when you flip it onto the plate. A hot oven and one firm press with a spatula are all it takes to go from a stack of raw rounds to a caramelized, crispy-edged centerpiece. Finished with a scatter of fresh parsley, it's the kind of side dish that makes people ask what restaurant you trained at.
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Preheat the oven to 425°F (220°C). Melt the butter in a small saucepan over low heat, then let it sit undisturbed for 2 minutes. Skim the white foam from the surface and carefully pour the clear golden liquid into a small bowl, leaving the milky solids behind — you should have about 4 tbsp clarified butter.
Using a mandoline or a sharp knife, slice the peeled potatoes into rounds approximately 1/8-inch (3mm) thick. Do not rinse or soak the slices — the surface starch helps the layers bind.
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