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To make the dough:
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1. Cut the butter into small pieces and break them apart. (I like to cut the stick lengthwise, turn it 90 degrees, and then cut it lengthwise again, so I have 4 long sticks. Then I cut regular tablespoon-size pats, so I end up with a bunch of 1/4 Tablespoon pieces.) Put the well-separated pieces of butter into a bowl and place it in the freezer for about 30-40 minutes, or until they are just barely frozen through.
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2. In a medium bowl, mix together the flour, sugar, and salt. Add the frozen butter and gently work it into the flour with your fingertips. Since it's frozen, you'll have to kind of smush it into the dry mix. Use your finger muscles! The butter will be incorporated enough when you have small pea-sized bits of butter left.
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3. Add the very, very cold water and stir it into the mixture. This shouldn't be enough moisture to bring the dough together, so add the Goldshlager 1 Tablespoon at a time until the dough will just form into a ball. Divide the dough evenly into two balls. Wrap each ball tightly in plastic wrap and squish it into the shape of a round disc, like a giant hockey puck.
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4. Chill the dough in the refrigerator for at least 2 hours, but overnight is okay too.
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To make the pie:
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1. In a bowl, combine the blueberries, rhubarb, sugar, tapioca starch, lemon zest, lemon juice, cinnamon, salt, and brandy. Mix until everything is incorporated and the fruit is well coated. Set aside.
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2. Remove one hockey puck of dough from the refrigerator. On a very well floured surface, roll out the dough evenly until it is big enough to cover your pie plate, plus a 1/2 inch or so. This is best achieved by constantly turning and flipping your dough so it doesn't stick to your surface. Don't be afraid to add too much flour, you can't. Transferring to the pie plate can be tricky. I like to fold the dough in half, and then in half again, and then transfer the quarter wedge to the plate and carefully unfold it. But use whatever method you like.
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3. Gently press the dough into the plate and trim off any dough overhanging more than a 1/2 inch over the plate. Using the excess bits to fill any holes or imperfections you have. Remember, you won't see the bottom crust, but you'll taste any spots where there's missing dough. Pour the blueberry mixture over the bottom crust and set aside.
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4. Remove the second hockey puck of dough from the refrigerator, and roll it out the same way you did the first one. When it is big enough to cover the pie with at least a 1/2 inch overhang, figure out what's going to be the center. You need to make vents in the top crust for the steam to escape. I cut a hole about the size of a shot glass in the very center, but it can be anywhere. You'll want at least one. I also cut a few smaller holes around the edges. When the dough is properly ventilated, carefully cover the pie, and again trim any excess. Tuck the two crusts under so it is flush with the plate. Using your fingers or a fork, crimp all the way around the edge of the pie so it's sealed. Cut a few more vents in the crust. Put the pie in the refrigerator to chill for about 20 minutes.
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5. While the pie chills, preheat your oven to 425 degrees and move the rack to the lower third of your oven. If you're worried about filling bubbling over and making a mess you can put a cookie sheet under the rack to catch any drippings.
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6. Beat the egg and milk together and brush evenly over the top of the chilled pie, making sure none of it pools. When the oven is ready, bake for 30 minutes, then knock the heat down to 375 degrees and bake for another 30 minutes. If the pie starts to get too brown before it is finished baking, cover it loosely with foil (I did this about 45 minutes in). The pie is finished baking when the crust is golden brown and the filling is thick and bubbling.
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7. Let the pie sit and fully cool before cutting into it to give the filling time to come together, at least 4 hours. Don't jump the gun, you'll regret it!
