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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2/3 cup sour cream, at room temperature
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1 teaspoons pure vanilla extract
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1 lemon, zested
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2 cups all-purpose flour
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1/4 cup cornstarch
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3/4 teaspoon kosher salt
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3/4 teaspoon baking soda
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*(Instead of making the cake layer from scratch you can also use a vanilla/ yellow box cake mixed with 1 stick melted butter and 2 beaten eggs instead making the cake layer from scratch. This is what my neighbor Cyndee does.)