Preheat oven to 375. In a food processor, pulse flour, brown sugar, butter, and salt until combined. In a large bowl, toss together blackberries, tapioca, granulated sugar, and orange zest and juice. Pour blackberry mixture into a 2-quart baking dish. Sprinkly evently with four mixture. Bake until topping is golden and juices are bubbling, about 50 minutes. LEt cool 20 minutes. Serve warm or at room temperature.
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