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1
Peel each apple and core it from the top, leaving the base fully intact so the cavity forms a sealed cup. Divide the butter, sugar, Calvados, and apple jelly equally among the four cavities, pressing the butter in first and spooning the remaining ingredients on top. The intact base is the sole barrier between the filling and the pastry; any breach will cause the internal sauce to leak before it can enrich the base.
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2
Divide the pâte brisée into four 150 g portions. Roll each on a lightly floured surface to a disc approximately 4 mm thick — thick enough to resist tearing when gathered. Centre an apple on each disc. Draw the pastry up around the fruit, pleating evenly, and twist the excess at the top into a firm stem shape. Press the seal closed. Prick a single vent hole through the crown with a thin skewer. Brush the entire surface with beaten egg wash. The pastry should be smooth, tightly enclosed, and show no tears.
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3
Transfer the wrapped apples to a lined baking tray and refrigerate for 30 minutes. The chilled fat in the pastry holds the gathered stem in place during the early stages of baking; a warm dough will slump and open.
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4
Heat the oven to 190 °C. Bake for 35 to 40 minutes. This is where the dish lives or dies: the pastry must reach a deep, even golden brown before the apple within becomes fibrous. At the 35-minute mark, insert a thin skewer through the vent hole — it should pass through the apple with no resistance whatsoever. If the pastry colours fully before the apple yields, reduce heat by 10 °C and continue; if the apple yields before the pastry colours, raise the heat briefly. Both conditions must be met simultaneously.
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5
Remove from the oven and rest for 5 minutes. The base pastry will have absorbed the butter-Calvados-sugar-juice pooled during baking; it should feel firm and heavy when the douillon is lifted with a palette knife, not sodden. Serve warm, crème fraîche poured over the cracked top at the table.