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1
Bake or steam the potatoes — do not boil. While still steaming hot, pass the flesh through a ricer immediately. The steam escaping during ricing carries moisture out of the potato; a cold potato traps that moisture instead. The riced potato should appear dry and slightly fibrous, not wet or glossy.
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2
Add the butter to the hot riced potato; it melts on contact. Add the egg yolks, salt, white pepper, and nutmeg. Work the mixture until uniform. The duchesse base is ready when it holds its shape cleanly when pressed and shows no wet sheen.
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3
Fold the room-temperature pâte à choux into the duchesse base in three additions, using a broad spatula with gentle, deliberate folds — not stirring. The ratio is 2 parts duchesse to 1 part choux by weight. The combined mixture is ready when it is light, slightly sticky, and drops from a spoon holding a soft shape without spreading flat.
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4
Using two wet spoons by the quenelle method (Entry 56) or a pastry bag, shape portions into ovals or cylinders of approximately 4 cm. Uniform size ensures even frying.
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5
Heat the neutral oil to 180 °C and hold it there throughout frying — this is where the dish lives or dies. Below 170 °C the pommes dauphine absorb oil and do not puff; above 190 °C the exterior sets before the interior steam has fully developed and the inside remains dense. A correctly formed pomme dauphine entering oil at the correct temperature produces an immediate, vigorous, slightly higher-pitched sizzle than a solid potato preparation — the airy choux component creating a more energetic steam release from the first second.
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6
Fry in uncrowded batches, turning once, for approximately 4 minutes total. Within 60–90 seconds the pieces should visibly expand — swelling outward and upward to roughly three times their original volume as the choux steam forces the crust open. At correct doneness the crust is deeply and evenly golden across all surfaces.
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7
Remove one piece and tap the underside gently with a fingernail. A hollow sound confirms that the interior has puffed and the crust is dry throughout. A dull, dense sound means the interior is still moist; return the batch to the oil for 30 seconds more. Pick up a drained piece: the crust should be rigid and dry — like a hollow chocolate — yielding only slightly under gentle fingertip pressure without collapsing.
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8
Drain briefly and dust immediately with fine sea salt, which dissolves into the hot crust and seasons every bite. Serve at once.