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1
For the pastry: In a large bowl, combine the flour, sugar and salt.
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2
Using a pastry blender, cut the butter into the flour mixture until you have something that resembles coarse meal with a few larger pea-sized pieces of butter.
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3
Add 6 tablespoons ice water and stir with a fork.
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4
If you can squeeze the mixture together in your hands, you have added enough water; if not, add a little more.
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5
The dough will look shaggy.
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6
Knead the dough with your hands a couple times in the bowl to get it to start to come together.
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7
Tip the dough out onto a piece of plastic wrap.
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8
Use the edges of the plastic wrap to help gather the dough and form it into a flat rectangle.
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9
Refrigerate for at least 1 hour.
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10
For the fillings: In a large saucepan, combine the blueberries, 1/2 cup of the sugar, 3 tablespoons of the cornstarch and the salt.
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11
Cook over medium heat, stirring occasionally, until the blueberries have released some juice and the sauce is thick, 6 to 8 minutes.
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12
Let cool completely
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13
In a medium bowl, beat together the cream cheese, lemon zest and the remaining 1 tablespoon cornstarch and 1/4 cup sugar until smooth.
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14
Beat in the egg yolk.
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15
Preheat the oven to 400 degrees F.
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16
For the egg wash: In a small bowl, whisk together the egg yolk with 1 tablespoon water.
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17
On a lightly floured piece of parchment, roll the dough out into a rectangle about 12 by 14 inches.
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18
Trim the ragged edges.
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19
(Pop the dough in the fridge to chill if it has gotten too soft.)
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20
Spread the cream cheese filling on the right half of the dough rectangle, leaving a 1 1/2-inch border around the edges.
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21
Top with the cooled blueberry filling.
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22
Brush the border with the egg wash. Use the parchment to lift the left half of the dough over the filling.
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23
Use a fork to seal the edges.
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24
Using the parchment, transfer the pie to a baking sheet.
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25
Brush the top with more egg wash and sprinkle with the sanding sugar if using.
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26
Use a small paring knife to cut a few small slits in the top to vent the pie.
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27
Bake until golden brown and set, 40 to 50 minutes.
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28
Transfer to a rack to cool before slicing.