INGREDIENTS
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4 cups fresh blackberries
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1 1/2 cups sugar, divided
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1/2 cup water
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6 tablespoons butter
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1 1/2 cups all-purpose flour
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2 1/2 teaspoons baking powder
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1/2 teaspoon salt
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1 1/2 cups milk, at room temperature
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1 teaspoon pure vanilla extract