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1
Roll the croissant dough to 4–5 mm thickness on a lightly floured surface. Cut into eight rectangles of approximately 10 cm × 12 cm. Keep the dough cold throughout; return it to the refrigerator if it begins to soften. The pieces are ready when they hold a clean edge and show no sign of butter seeping through.
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2
Place a tablespoon of cold, firm crème pâtissière in the centre of each rectangle. Press one well-drained apricot half into the cream, cut-side down. The cream must be cold and hold its shape without spreading; if it flows, the pastry will not seal and the filling will leak during baking — this is where the dish lives or dies.
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3
Fold the dough: either bring the two short ends over the filling to overlap at the centre, forming a rectangular parcel, or fold diagonally to create a triangle with the apricot visible at one open end. Press all seams firmly with fingertips to seal. The seam should feel taut and show no gaps.
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4
Arrange the oranais on a lined baking tray, seam-side down. Proof at 27 °C for 75–90 minutes. The pastries are ready when they have visibly swelled, feel light and airy to a gentle touch, and the laminated layers are just discernible beneath the surface. Do not allow proofing to continue beyond this point; over-proofed dough will show butter pooling on the tray.
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5
Brush each oranais carefully with beaten egg, taking care not to let the wash run down the cut edges and glue the layers shut. Bake at 185–195 °C for 14–16 minutes. The oranais are done when they are deep golden across the entire surface and the underside sounds hollow when tapped.
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6
Immediately upon removal from the oven, heat the strained apricot jam with the tablespoon of water or kirsch until fluid. Brush a thin, hot layer over each oranais. The nappage is correctly applied when it dries to a clear, even gloss within a minute; a cloudy or thick coat indicates the glaze was too cool or too heavy.