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5 tablespoons unsalted butter, plus more for greasing |
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1 cup fresh or frozen blackberries |
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2 tablespoons granulated pure cane sugar |
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1 tablespoon fresh lemon juice |
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1/2 cup packed, light brown muscovado sugar |
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3/4 cup toasted hazelnuts, coarsely chopped |
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One 17.3-ounce/2-sheet package all-butter frozen puff pastry, defrosted |
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4 tablespoons unsalted butter, room temperature |
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2 cups fresh blackberries, halved |
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1/3 cup granulated pure cane sugar |
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2 teaspoons ground cinnamon |
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