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1
Work with the foie gras cold. Open the lobe and, using the fingers and a small knife, extract the central vein network without tearing. The fat is firmer when chilled, and the veins pull more cleanly. Slice the deveined lobe into tranches 1.5–2 cm thick — thinner and the exterior cooks before the interior warms through; thicker and the exterior burns before the interior reaches temperature. Return the slices to the refrigerator until the moment of cooking. The slices are ready when they hold their shape cleanly and the cut faces are smooth and unbroken.
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2
Set a cast-iron or heavy stainless-steel pan over the highest available heat. Use no butter, no oil — the foie gras's own considerable fat content will provide the frying medium. The pan is at the correct temperature when a drop of water dropped onto the surface evaporates immediately and completely on contact — it must not skitter across the surface (the Leidenfrost effect indicates insufficient heat). The empty pan should be radiating heat visibly. There must be no smoke before the foie gras goes in.
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3
Season both sides of each tranche with fine sea salt and white pepper at the last possible moment — not in advance, as the salt will begin drawing moisture from the cut surface. Lay the slices into the dry hot pan. The sound is the test: foie gras hitting a correctly hot pan produces a violent, cracking sizzle, louder and higher-pitched than any meat, as the fat releases and vaporises instantly. This sound must sustain for the entire searing time. If the sound subsides into a soft, wet simmering, the pan was insufficiently hot and the foie gras is sitting in rendered fat rather than searing.
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4
This is where the dish lives or dies. Do not move the slices. After 40–50 seconds, lift the edge of one slice to check the underside: it must be deep gold to dark amber — the same depth of colour as a correctly seared mi-cuit surface. Pale gold is insufficient Maillard development; dark brown means the exterior fat has over-rendered and the crust is burning. Turn each slice once, once only, and sear the second side for 30–40 seconds. Total time in the pan: 70–80 seconds for a 1.5 cm slice. The window between perfect and overcooked is 10 seconds wide, and there is no recovery from exceeding it.
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5
While the second side sears, press the top surface of a slice gently with a fingertip. At the correct doneness the slice yields completely without resistance — like pressing a warm pat of butter, or a ripe avocado. If it yields but springs back slightly, it is at the outer limit of the window. If it resists, the fat has begun to render fully and the texture will be dense and grainy. The internal temperature at this point is approximately 55–60 °C. Remove the slices immediately to warm plates — never cold plates.
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6
Season the surface of the crust with fleur de sel applied to the plate rather than directly dissolved into the preparation. The crystal structure of fleur de sel on the crust provides a textural contrast that fine sea salt cannot replicate. The rendered foie gras fat remaining in the pan may be deglazed immediately while the Maillard compounds remain soluble, or cooled, strained, and reserved for other use. Serve at once.