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Combine the flour, salt and shortening in the bowl of a food processor and pulse until the ingredients become crumbly.
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With the motor running, add the cold water until the mixture starts holding together.
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Turn out and form into a ball. At this point, you can chill it in the fridge until ready to use.
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To make the pie, roll out half the pastry on a lightly floured surface and fit into a 9" pie plate.
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Set aside.
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Place the rhubarb in a microwavable bowl, cover and microwave on high 50 to 60 seconds or until slightly softened.
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In a large bowl, combine the rhubarb, apples, blackberries and raspberries.
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Combine the sugar, flour and corn starch.
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Toss with the fruit to coat evenly.
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Transfer to the pie shell, dot with butter and sprinkle with lemon juice.
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Roll out the remaining pastry.
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Moisten the rim and fit over the filling, pressing gently along the rim.
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Trim the edge and crimp.
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Slash the top to allow the steam to escape.
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Bake in a preheated 425 degree F oven 15 minutes.
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Reduce the heat to 350 degrees F and bake 35 minutes or until the pastry is golden and the filling is bubbly.
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Cool on a rack.