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1
Whip the egg whites in a scrupulously clean bowl to soft peak. Add the 150 g caster sugar gradually, a spoonful at a time, whisking continuously. Continue until the meringue reaches a stiff, glossy peak — it should hold a firm curl and show no graininess when a little is rubbed between the fingers.
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2
Combine the whole milk, split vanilla pod, and sugar in a wide, shallow pan. Bring to 80–85 °C — a faint surface movement, a gentle steam, and no active bubbles. This is where the dish lives or dies: above 90 °C the meringues over-expand, their protein network tears, and they collapse to flat, weeping discs on cooling; at 80–85 °C they swell gently and hold their form. Use a thermometer on the first attempt; the visual and audible cues become reliable thereafter.
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3
Using two wet spoons, shape quenelles of meringue and slide them gently into the warm milk. Within 60 seconds each quenelle should swell by approximately 30 % of its original volume — gradually and uniformly. Rapid, dramatic swelling signals that the milk is too hot; reduce the heat immediately.
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4
Poach for 2 minutes, then turn each quenelle carefully with a spoon and poach for a further 2 minutes. Prod a quenelle gently: it should offer the resistance of a softly set egg white at the surface with a slight give at the centre. A fully firm quenelle with no give is over-poached and will be rubbery at service; continue for 1 minute only if the centre remains liquid.
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5
Lift the meringues with a slotted spoon onto a clean cloth and allow to cool. Service must follow within 30 minutes; longer and the meringues will weep, pooling liquid at their base.
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6
Strain the poaching milk into a clean pan. Add additional whole milk if necessary to reach 500 ml. Whisk the 6 yolks with the caster sugar until pale, then combine with the warm milk and cook over gentle heat, stirring constantly, until the crème anglaise coats the back of a spoon — nappe stage (Entry 65, Jacques Pépin's Complete Techniques). Draw a finger across the coated spoon: the line should remain clean and distinct.
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7
Make the caramel by the dry method (Entry 21, Jacques Pépin's Complete Techniques): melt the sugar in a clean, dry pan over moderate heat without stirring until it reaches a deep amber. Below 160 °C the caramel remains hygroscopic and will not set to brittle; the correct colour is a rich, dark amber with a faint bitter aroma.
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8
At service, pour the crème anglaise into a wide shallow bowl or individual dishes. Float the meringue quenelles on the surface. Immediately pour a thread of hot caramel over the meringues and the custard surface: the caramel should hit the cool surfaces and begin to set into brittle lacework within seconds. Within 30 seconds it must be fully hard and brittle — the transformation from liquid to glass at the moment of service is the defining theatrical element of the dish.