INGREDIENTS
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For Cake:
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3 cups cake flour
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2 1/2 cups granulated sugar
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1 tablespoon baking powder
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1 teaspoon salt
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1 1/2 cups (3 sticks) unsalted butter, softened and cut into cubes
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1 cup whole milk, divided
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5 large eggs
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4 teaspoons lemon or Meyer lemon zest (from 4 medium lemons)
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3 tablespoons lemon or Meyer lemon juice (from 4 medium lemons)
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1 teaspoon vanilla extract
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For Frosting:
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1 1/2 cups (3 sticks) unsalted butter, room temperature
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1 cup cocoa powder
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4 1/2 cups powdered sugar
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1/2 to 3/4 cup heavy cream, more or less as needed
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1 1/2 teaspoons vanilla extract