"Dorie Greenspan really got it right with this cake. I thought the buttercream was quite rich, so I opted to frost the outside with lightly sweetened whipped cream. I think it would be equally good if you used the whipped cream in the layers too...."
INGREDIENTS
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FOR THE CAKE:
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2 1/2 cups cake flour
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1 Tablespoon baking powder
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1/2 teaspoon salt
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1 1/4 cups buttermilk
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4 large egg whites
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1 1/2 cups granulated white sugar
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2 teaspoons freshly grated lemon zest
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1/2 cup (1 stick) unsalted butter, at room temperature
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1/2 teaspoon pure lemon extract
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FOR THE BUTTERCREAM:
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1 cup granulated white sugar
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4 large egg whites
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1 1/2 cups (3 sticks) unsalted butter, at room temperature
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1/4 cup freshly squeezed lemon juice (from 2 large lemons)
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1 teaspoon vanilla extract