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1
Tear the stale French bread into rough chunks and spread them in the baking dish. The bread must be dry enough to actively absorb liquid — press a chunk between the fingers; it should feel firm and slightly brittle, not yielding. Fresh or insufficiently staled bread will not absorb the custard cleanly and will collapse into paste.
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2
Whisk together the eggs, cream, sugar, vanilla, cinnamon, and nutmeg until the sugar is fully dissolved and the mixture is uniform. Fold in the bourbon-soaked raisins. Pour the custard over the bread, pressing the chunks firmly down into the liquid. Allow to soak for a minimum of 30 minutes, pressing the bread into the custard periodically. The bread is ready when every piece has absorbed custard to its centre — no dry or pale patches remain when a chunk is broken open.
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3
Heat the oven to 175 °C. Transfer the soaked bread and custard to a buttered baking dish if not already in one. Bake until the surface is golden and slightly crisp where it contacts the dish walls, and the centre yields a slight, uniform jiggle — not liquid movement — when the dish is shaken. This is where the dish lives or dies: remove it the moment the centre is just set. Overbaking drives out the custard and produces a dry, rubbery interior; the centre will continue to firm as the pudding cools.
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4
While the pudding rests, make the whiskey sauce. Melt the butter in a saucepan over medium heat, add the sugar and cream, and stir until the sugar is fully dissolved and the sauce is smooth and pourable. Remove from heat, add the bourbon, and return to low heat only long enough to warm it through. The sauce is ready when it coats a spoon and smells unmistakably of bourbon — not butterscotch with a whiskey echo. If the bourbon character is faint, the alcohol was cooked too long.
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5
Serve the pudding warm, portioned directly from the dish. Pour the whiskey sauce over each portion at the table so that it pools around the pudding on the plate. The exterior should be golden and slightly crisp; the interior, when a spoon breaks through, should be custardy, soft, and fully saturated — no dry patches.