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1
Preheat the oven to 350.
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2
In a heavy 14-inch skillet, combine the sugar, light corn syrup, water and vanilla bean and seeds and bring to a boil, stirring to dissolve the sugar.
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3
Cook over moderate heat without stirring, gently swirling the syrup in the skillet occasionally and washing down the side of the skillet with a wet pastry brush, until a medium-light amber caramel forms, about 10 minutes.
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4
Off the heat, stir in the butter.
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5
Add the sliced quince and cook over moderately low heat, stirring occasionally with a nonstick rubber spatula, until softened, about 5 minutes.
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6
Let the quince cool slightly.
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7
Evenly distribute the quince slices over the bottom of the skillet or, for a neater appearance, carefully arrange them in concentric circles.
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8
On a lightly floured work surface, roll out the puff pastry to a 14-inch square.
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9
Using the skillet lid as a template, cut out a 14-inch round.
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10
Cut eight 1-inch-long steam vents in the pastry round and lay it over the fruit.
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11
Bake the tart in the center of the oven for about 55 minutes, until the pastry is golden brown and cooked through.
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12
Let the tart stand for 15 minutes.
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13
Cover the tart with a large plate and very carefully invert the tart onto the plate.
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14
Cut into wedges and serve with creme fraiche.