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1
Preheat oven to 350 F.
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2
In a bowl, with a mixer on medium speed, beat 1/2 butter and the brown sugar until smooth.
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3
Beat in egg yolk and vanilla. Add flour and 1/4 teaspoon salt and beat until mixture forms a ball.
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4
Press dough over bottom and up sides of a 9 - inch fluted tart pan with removable rim. Freeze until firm, 15 minutes.
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5
Meanwhile spread pecans in a large baking pan. Bake until lightly golden, about 8 minutes
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6
Leave oven on). When pecans are cool enough to handle, chop 2 cups; reserve remainder.
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7
Bake tart shell until golden, 16 to 18 minutes. Transfer to a wire rack.
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8
Meanwhile, in a 3 to 4 quart pan over medium heat, combine sugar, corn syrup and 1/4 cup water. Stir until sugar is dissolved, then increase heat to high and boil,, swirling mixture occasionally, until mixture is a deep golden brown, 10 to 15 minutes. Remove from heat and stir in whipping cream, remaining 1/4 cup butter and remaining 1/2 teaspoon salt ( mixture will foam). Stir until smooth.
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9
Spread chopped pecans in tart shell, then pour in hot caramel; spread level. Garnish edge of tart with reserved pecans halves. Let tart cool until caramel is firm enough to slice, at least 4 hours, or chill up to 2 days (bring to room temperature before serving). Cut into thin wedges.
