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1
Warm the reserved scallop shells on a baking tray in a 80 °C oven while the rest of the dish is prepared. Press the shucked scallops and their corals between several layers of paper towel for 10 minutes. The surface must be completely dry to the touch — any residual moisture will prevent the Maillard reaction and the scallops will steam rather than sear.
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2
For the beurre blanc, combine the Muscadet and finely chopped shallots in a small saucepan. Reduce over medium heat until only 2–3 tablespoons of liquid remain and the shallots are soft. Over very low heat, whisk in the cold butter cubes a few at a time, maintaining an emulsion that coats the back of a spoon in a pale, glossy ribbon. Keep warm off the heat.
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3
Season the dried scallops on both flat faces with fleur de sel and white pepper immediately before cooking — no earlier, as salt draws moisture. Set a heavy pan over the highest heat available and add the grapeseed oil. The oil must be smoking before the scallops enter the pan; a drop of water should evaporate instantly on contact.
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4
This is where the dish lives or dies: lay the scallops flat in the pan without crowding — cook in two batches if necessary. Sear for exactly 90 seconds without moving them, until a deep golden crust has formed on the underside. Add the knob of salted butter and turn the scallops; sear for a further 90 seconds, basting once with the foaming butter. Press the side of each scallop gently: the outer 3–4 mm should feel just firm and opaque white, while the very centre gives softly and remains glassy and translucent — a clear gradient from cooked surface to raw core.
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5
Remove the scallops to a warm plate. Add the corals to the same pan and sear for 30 seconds per side only — they cook faster than the muscle and become grainy if taken further. The coral should be just set, yielding to light pressure, and retain a vivid orange colour.
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6
If using the cider deglaze in place of beurre blanc, pour the cider into the hot pan off the heat, return to the flame, and reduce for 30 seconds, scraping up all caramelised deposits. The sauce should smell of apple and browned butter and reduce to a scant, glossy film. Finish with a squeeze of lemon.
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7
Retrieve the warmed shells from the oven. Place three scallops and their corals on each shell, spoon beurre blanc (or deglazed pan juices) around them, and serve immediately on the shell. The shell should be warm but not scalding to the hand.