INGREDIENTS
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Dough
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2 1/2 cups flour, plus extra for sprinkling
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3/4 cup superfine sugar
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2 sticks (8 oz) soft butter, diced
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1 large egg yolk
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2 teaspoons vanilla extract
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1/2 teaspoon salt
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Filling
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1 cup powdered sugar, sifted
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4 tablespoons softened butter, plus extra for greasing
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Jelly or jam
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A few drops of vanilla extract
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1 teaspoon water