INGREDIENTS
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For the cake
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1 cup plus 2 tablespoons (2 sticks plus 2 tablespoons) unsalted butter, at room temperature; more for greasing pans
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3 large eggs
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1 cup sour cream
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1 teaspoon vanilla extract
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1/2 teaspoon finely grated lemon zest
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2 1/2 cups cake flour
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1/2 cup finely ground almonds
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1 1/2 cups sugar
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3/4 teaspoon baking powder
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3/4 teaspoon baking soda
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3/4 teaspoon salt
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For the buttercream
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4 large egg whites
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1 cup sugar
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Large pinch salt
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3/4 pound unsalted butter 3 sticks, at room temperature
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3 tablespoons fino (dry) sherry
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1/2 teaspoon finely grated lemon zest
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1/4 teaspoon ground cinnamon