INGREDIENTS
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12 tablespoons (1 1/2 sticks) unsalted butter, at room temperature
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2 cups sugar
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4 extra-large eggs, at room temperature
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3/4 cup sour cream, at room temperature
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1/2 teaspoon grated lemon zest
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1/2 teaspoon grated orange zest
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1/2 teaspoon pure vanilla extract
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2 cups all-purpose flour
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1/4 cup cornstarch
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1/2 teaspoon kosher salt
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1 teaspoon baking soda
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For the filling for each cake:
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1 cup (1/2 pint) heavy cream, chilled
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3 tablespoons sugar
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1/2 teaspoon pure vanilla extract
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1 pint fresh strawberries, hulled and sliced