INGREDIENTS
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1/3 cup superfine sugar
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1/4 cup unsalted butter, softened
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2 large egg yolks
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1/4 teaspoon almond extract
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1 cup ground almonds
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1 tablespoon all-purpose flour
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1 sheet puff pastry, thawed and rolled out into a 16x16-inch square
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1 egg
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1 tablespoon water
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2 tablespoons sliced almonds, or to taste
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2 tablespoons superfine sugar, or to taste