INGREDIENTS
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2 cups all-purpose flour
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1/3 cup sugar
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1 tablespoon baking powder
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1/2 teaspoon salt
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finely grated zest of 1 lemon
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3 tablespoons cold unsalted butter, cut into 1/4-inch piece
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1 egg yolk
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1 cup heavy or whipping cream, plus a spoonful or two for to
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1/2 teaspoon vanilla extract