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Preheat oven to 400 degrees F
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Line a baking sheet with aluminum foil.
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Grease a 12-inch skillet with non-stick spray or vegetable oil.
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In a large bowl, mix the flour, 1/2 cup sugar, baking powder, and salt. To this mixture, cut in butter until the mixture resembles coarse crumbs. *video above for this procedure.
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Next, to this mixture, stir in 1/4 cup boiling water just until the mixture is evenly moist.
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In a separate bowl, dissolve the 2 tablespoons cornstarch in 1/4 cup cold water.
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To the cornstarch mixture, mix in remaining 1 cup sugar, lemon juice, and blackberries.
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Transfer berry mixture to a cast-iron skillet and bring to a boil. Stir frequently.
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When berries begin to thicken slightly, drop the dough into the skillet by spoonfuls.
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Place skillet on the foil lined baking sheet.
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Bake 25 to 30 minutes at 400 degrees until top is golden brown.
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Serve warm with vanilla ice cream