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1
One to two hours before service, remove the melons from any cool storage and hold at ambient temperature (18–20 °C). Do not refrigerate at any point after purchase. Before cutting, press the blossom end gently — slight give with a clear apricot-rose fragrance at 10 cm from the stem end confirms readiness. If neither softness nor aroma is present, do not proceed to service.
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2
Halve each melon through the equator with a single clean cut. Scoop the seeds and fibrous strands from the cavity with a spoon and discard. Inspect the exposed flesh: it must be a uniform deep salmon-orange, dense to the rind, with a slightly moist seed cavity. Green or white flesh near the rind indicates under-ripeness; translucent or waterlogged flesh indicates over-ripeness. Either condition is a failure that preparation cannot correct.
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3
Place each melon half flesh-side up on a plate. Lay the sliced jambon de Bayonne alongside — not over — the melon, so the ham's salt reads as contrast rather than covering the fruit. At the moment of service, pour 30 ml of chilled Banyuls into the hollow of each half so the wine collects in the cavity. This is where the dish lives or dies: the wine must meet warm melon flesh at table, never cold flesh from the refrigerator — cold suppresses the volatile aromatics entirely and the defining aromatic encounter between oxidative wine and ripe Cavaillon melon cannot be recovered.
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4
Serve immediately, before the Banyuls loses its chill against the warm flesh. The guest's first taste should deliver tropical sweetness, apricot and rose florality in the flesh, oxidative honey and dried fruit from the wine, and mineral salt from the ham. Any starchy, bland, or watery finish confirms cold service or incorrect ripeness.