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1
Submerge the sweetbreads in a bowl set under cold running water for 2–4 hours. The water runs clear and the lobes lose their pink-grey flush; residual blood is fully drawn out.
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2
Lower the sweetbreads into a pan of simmering court-bouillon and blanch for 5 minutes. Lift out immediately and refresh in a bowl of ice water. While the lobes are still warm and pliable, peel away every trace of outer membrane and connective tissue with fingers and a small knife. Cold sweetbreads stiffen and the membrane becomes difficult to remove cleanly; work quickly. The surface should be smooth and entirely free of sinew.
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3
Lay the cleaned sweetbreads between two sheet pans and set a 2 kg weight evenly on top. Refrigerate for 2–4 hours. The lobes compress to a uniform thickness of 2–3 cm; when pressed with a finger the surface springs back with uniform resistance across the entire medallion.
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4
Remove from the refrigerator and cut into medallions 2 cm thick. Season with fine salt and white pepper, then dredge lightly and evenly in flour, shaking off any excess. Each medallion should carry only a fine, matte coating.
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5
Heat clarified butter in a heavy sauté pan to 170 °C — the butter shimmers but does not smoke. Place the medallions in a single layer without crowding. Sear over medium-high heat for 3–4 minutes per side, resisting the urge to raise the heat. This is where the dish lives or dies: sweetbreads contain little protein for the Maillard reaction and the flour coating must build the crust patiently and gradually; a pan that is too hot burns the flour before the crust can develop. The finished surface is deep golden, approaching mahogany, and the crust is firm and audibly crisp when pressed with a spatula.
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6
Lift the medallions onto a warm plate and tent loosely. Pour off excess butter. Deglaze the pan with dry white wine, scraping up the fond, and reduce by half. Draw the pan off the heat and mount with cold butter, swirling until the sauce is glossy and lightly napped. The interior of a probed medallion reads 60–65 °C; the flesh yields under a knife with creamy, not chalky, resistance.