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1
Crack each egg individually into a fine-mesh strainer and allow the loose outer albumen to drain away. Transfer each egg to its own small cup. This preliminary step produces a tighter, more cohesive white during poaching. The egg is ready when no watery albumen remains in the strainer.
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2
Bring a deep saucepan of water to 80–82°C and add 15 ml white wine vinegar per litre. Slide the eggs into the water one at a time and poach for exactly 3 minutes and 30 seconds. Transfer immediately to an ice bath at 0–2°C to arrest cooking. The white must be fully set and opaque; the yolk, when pressed lightly, should yield with the unmistakable give of a fluid centre.
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3
Remove the eggs from the ice bath. With scissors, trim any trailing wisps of white to achieve a clean, ovoid form. Each egg should present a smooth, even outline with no ragged edges visible.
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4
Melt the clarified stock and dissolve the gelatin to achieve a 3–4% concentration. Cool the aspic to 28–30°C, stirring gently, until it is just viscous enough to coat the back of a spoon without running freely. Pour a 5 mm base layer into each chilled dariole mould or oval ramekin. Refrigerate for 10 minutes until the layer is just set — it should tremble but not flow when the mould is tilted.
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5
Arrange the decorative garnish — blanched tarragon leaves, truffle diamonds, or jambon de Paris julienne — on the set base layer. Spoon a thin veil of aspic at 28–30°C over the garnish to anchor it, taking care that the aspic is not warm enough to melt the set layer beneath. Refrigerate for a further 10 minutes until this second layer is firm.
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6
Place one trimmed poached egg, yolk-side down, in the centre of each mould. Fill each mould to the brim with aspic at 28–30°C. Refrigerate for a minimum of 4 hours. The aspic must be fully set throughout — crystal-clear and without tremor when the mould is moved.
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7
To unmould, dip the exterior of each mould in warm water at 35°C for 3–5 seconds only. Invert onto a chilled plate. The aspic should release cleanly, retaining its gloss and the sharp definition of the garnish within. Serve immediately. When cut at table, the yolk flows in a controlled stream against the trembling clarity of the surrounding gelée.