INGREDIENTS
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3/4 pound Italian prune plums, quartered and pitted
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2 tablespoons Minute tapioca
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2 tablespoons creme de cassis liqueur
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1 3/4 cups sugar, divided
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1/4 pound (1 stick) unsalted butter, at room temperature
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1 1/4 cups all-purpose flour
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1/2 teaspoon ground cinnamon
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1/2 teaspoon kosher salt
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1/4 teaspoon baking powder