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1
Combine the flour and sugar in a bowl. Add the beaten eggs and incorporate. Pour in the milk gradually, whisking to a smooth, fluid batter free of lumps. Stir in the melted salted butter and vanilla. The batter should be as thin as single cream — it runs off the whisk in an unbroken ribbon.
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2
Heat the billig (cast-iron Breton crêpe griddle) to 200–210 °C. Verify heat by flicking a drop of water onto the surface: it should skitter and evaporate within one second. Lightly oil the surface. Do not wash the billig with soap at any stage; wipe only.
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3
Pour a small ladleful of batter onto the centre of the billig and spread immediately with the rozell (wooden spreading tool) using a single continuous spiral motion, working outward to a crêpe no more than 0.5 mm thick. This is where the dish lives or dies: a crêpe spread too thick will not caramelize to crispness, and a griddle too cool will leave it pale and soft. The surface must turn deep gold — almost amber — within 60 to 90 seconds; the edges will pull away from the iron and the entire crêpe will colour evenly.
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4
Working within the 10-second window while the crêpe remains pliable, slide a thin spatula beneath it and roll it tightly around a wooden dowel. Slide the rolled dentelle off the dowel at once. The crêpe yields to the roll without cracking — if it resists or shatters, the window has closed.
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5
Transfer the rolled dentelle to a wire rack and allow to cool completely. Once cold, it will be utterly rigid and hollow — a crisp, lace-like cylinder that shatters cleanly at the slightest pressure. Store immediately in an airtight tin; humidity will soften the dentelles within hours.