INGREDIENTS
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1 3/4 cups AP flour
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1 Tablespoon sugar
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1 1/2 sticks butter (not unsalted), cut into slices
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1/4 cup (scant) ice cold water
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for the filling and topping:
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3 cups fresh blueberries
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1/2 cup sugar
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1 Tablespoon cornstarch
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zest and juice of 1 lemon
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1 teaspoon cinnamon
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2 Tablespoons butter, cut into small pieces
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1 egg, beaten
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2 teaspoons vanilla sugar or just turbinado sugar (an unprocessed, coarse sugar)