INGREDIENTS
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Filling
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6 cups blackberries
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1/3 cup sugar
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1 Tbsp. all-purpose flour
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2 tsp. lemon zest
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Pinch of salt
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Topping
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1 1/4 cups all-purpose flour
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1/3 cup sugar
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2 tsp. baking powder
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1/2 tsp. ground cinnamon
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1/4 tsp. salt
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1 large egg yolk, beaten, at room temperature
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1/2 cup buttermilk
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6 Tbsp. unsalted butter, melted
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1/2 tsp. pure vanilla extract
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Fresh mint, for garnish (optional)