INGREDIENTS
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2 teaspoons grated lemon zest
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1 tablespoon fresh lemon juice
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Unsalted butter, for the dish
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1 loaf (about 1 pound) sliced white sandwich bread
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1 vanilla bean
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1 cup heavy cream
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2 tablespoons confectioners' sugar
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8 cups blackberries (about 6 half-pints), plus more for serving
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3/4 cup granulated sugar
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2 tablespoons honey or agave syrup