"Cook's Country..."
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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1/4 cup fresh lemon juice
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3 tablespoons grated fresh lemon zest (about 3 lemons)
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1 teaspoon vanilla extract
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1 3/4 cups sugar
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12 tablespoons unsalted butter, softened (1 1/2 sticks)
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3 large eggs, room temperature
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1 large egg yolk, room temperature
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3 cups powdered sugar
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3 tablespoons fresh lemon juice
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2 tablespoons buttermilk