12 tablespoons (1½ 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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⅔ 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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¼ cup cornstarch
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¾ teaspoon kosher salt
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¾ teaspoon baking soda
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*{Instead of making the cake layer from scratch you can also use a vanilla/ yellow box cake (one without pudding) mixed with 1 stick melted butter and 2 beaten eggs (nothing else is added!). This is what my neighbor Cyndee does.}