"This moist, lemony plum cake needs little more than a dusting of confectioners' sugar. If you like, though, a dollop of sour cream is a delicious accompaniment...."
INGREDIENTS
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3/4 cup (1 1/2 sticks) unsalted butter, room temperature, plus more for pan
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1 1/2 cups plus 2 tablespoons all-purpose flour (spooned and leveled)
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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1/2 cup packed light-brown sugar
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1/2 cup granulated sugar
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3 large eggs
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1 teaspoon pure vanilla extract
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2 teaspoons finely grated lemon zest
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1/4 cup sour cream
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3 plums, halved, pitted, and cut into eighths
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Confectioners' sugar, for dusting