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1
In a small bowl, beat egg yolk with 2 tablespoons water. In a large bowl, combine flour and salt; cut in butter until crumbly. Gradually add yolk mixture, tossing with a fork; add additional water 1 tablespoon at a time, as needed, until dough forms a ball. Divide dough into two portions, one with three-quarters of the dough and one with the remainder. Shape each into a disk; cover and refrigerate 1 hour or overnight.
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2
For filling, in a Dutch oven, melt butter. Saute potatoes, carrots, celery and onion until crisp-tender, 5-7 minutes. Stir in flour, bouillon, tarragon and pepper. Gradually stir in cream. Bring to a boil; cook and stir until thickened, about 2 minutes. Stir in chicken and peas; set aside to cool completely.
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3
On a lightly floured surface, roll out larger portion of dough to fit bottom and up the sides of an 8-in. springform pan. Place dough in pan; add cooled filling. Roll remaining dough to fit over the top. Place over filling. Trim, seal and flute edge. Cut slits in top. Chill for at least 1 hour.
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4
Lightly beat egg white with 1 teaspoon water. Brush over the top crust; sprinkle with celery seed. Place pie on a rimmed baking tray.
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5
Bake at 400u00b0 until crust is golden brown and filling is bubbly, 50-55 minutes. Cool on a wire rack for at least 30 minutes before serving.
