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1
Use a little of the butter to grease a large baking dish. Cut the bread into slices one inch thick. Cut the slices in half diagonally. Arrange the bread in the baking dish in two or three rows, overlapping the slices of bread as necessary to make them fit. Set aside.
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2
Place 1/2 cup of the brown sugar in a large bowl. Slice the vanilla bean in half lengthwise. Using a paring knife, scrape the seeds from the vanilla bean into the sugar. Use your fingers to rub the vanilla seeds into the sugar to distribute them evenly. Add the eggs, milk, ginger and 1/2 teaspoon of the salt. Whisk well to combine.
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3
Pour the custard evenly over the bread in the baking dish. Depending on the size of your dish, you may need to gently push the slices down into the custard with a spoon or flexible spatula so the bread can soak up as much custard as possible.
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4
Cover with plastic wrap and chill for at least 6 hours and up to 24 hours to allow the custard to soak into the bread. If you notice that there is custard pooling in the bottom of the baking dish, spoon some of the custard over the bread once or twice while it's chilling. You can also place another roasting pan or pie dish on top of the soaking bread to gently push it down into the custard if your bread is on the sturdy side. The extent to which the custard is absorbed will depend on the type of bread you use and how dry it is.
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5
When you are ready to cook the French toast, preheat the oven to 400u00b0F. Remove the baking dish from the refrigerator. If there is still a bit of custard pooling at the bottom of the baking dish, tip out the excess. Set aside.
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6
If you are using pre-roasted and skinned hazelnuts, roughly chop them and set aside. If you have raw hazelnuts, place them on a rimmed sheet pan and toast until fragrant, about 7 minutes. Remove the nuts from the pan so they don't burn. Place them in the middle of a kitchen towel. Bring the four corners of the towel towards each other and twist them together until you have securely enclosed the nuts in the towel. Vigorously rub the hazelnuts together inside the towel for a minute or so. When you open the towel most of the skins should have fallen off. Roughly chop the toasted and skinned nuts and set aside.
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7
Peel and core the pears then slice them 1/8-inch thick. Heat 4 tablespoons of the butter in a large skillet over medium-high heat. When the butter has melted, add the remaining 1/2 cup brown sugar and 1/2 teaspoon salt. Add the pears and cook, stirring occasionally, until tender and the caramel starts to thicken, about 5 minutes. If your pears are quite ripe, it will take a little longer for the moisture to cook off and the caramel to thicken. Remove the pears from the heat and add the chopped hazelnuts. Stir to coat the nuts in caramel.
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8
Spoon the pears and nuts over the prepared bread, tucking some of the caramelized pear in between the slices. Cut the remaining tablespoon of butter into small pieces and dot the top of the French toast with it. Place in the oven and bake for 30-35 minutes, until the custard has set and the French toast is golden brown.
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9
While the French toast is baking, make the syrup: Place the blackberries and syrup in a small saucepan and cook over medium heat until the berries are soft and starting to fall apart, about 5 minutes. Strain the syrup through a fine-mesh sieve into a small bowl, pushing on the berries with a spoon or spatula to extract as much berry pulp as possible. Stir the salt and cardamom into the warm syrup.
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10
Rest the French toast for 5-10 minutes before serving with warm Blackberry-Cardamom Syrup.
