INGREDIENTS
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2-1/2 cups cake flour
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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3/4 cup buttermilk, room temperature
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3 tablespoons grated lemon zest from 3 lemons
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1/4 cup lemon juice from 3 lemons
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1 teaspoon vanilla extract
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1-3/4 cup granulated sugar
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12 tablespoons (1-1/2 sticks) unsalted butter, softened
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3 large eggs, room temperature
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1 egg yolk, room temperature
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Glaze
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3 cups confectioners' sugar, sifted
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3 tablespoons lemon juice
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2 tablespoons buttermilk