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1
In a Dutch oven, heat oil over medium heat and saute the chicken, in batches, until lightly golden but not cooked through.
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2
Set aside.
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3
In the same, cleaned pan, melt 2 tablespoons butter.
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4
Saute the onions until golden brown, about 5 minutes.
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5
Remove to bowl with the chicken.
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6
Repeat with carrots and celery and then mushrooms.
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7
In a separate pan, heat stock to boiling.
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8
Clean Dutch oven again.
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9
Melt remaining butter over medium heat.
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10
Whisk in flour and cook until pale gold, 2 minutes.
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11
Whisk in boiling stock, half-and-half, herbs, sherry and salt and pepper and heat to a slow boil.
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12
Reduce heat and simmer 5 minutes or until thick enough to coat a spoon.
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13
(If too thick, add more stock.)
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14
Stir in 2 tablespoons lemon juice, the chicken and vegetables.
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15
Cover with buttered parchment.
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16
(Pie can be prepared ahead to this point and refrigerated until 1 hour before cooking.)
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17
Preheat oven to 425 degrees.
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18
Roll out the pastry into a square just less than 1/2 inch thick and, using a very sharp knife, cut a round the size of the pot.
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19
Line a rimmed baking sheet with parchment and invert the round on top.
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20
(Sprinkle the scraps with sugar, twist them into corkscrew shapes and bake them as cookies.)
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21
If using Dufour, follow package directions.
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22
Brush pastry with egg wash, without letting any drip down the sides, which will prevent it from rising evenly.
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23
Prick all over with a fork.
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24
(For a flatter, denser crust, omit the wash, cover pastry with a second sheet of parchment paper and a second sheet pan on top, forming a sandwich.
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25
This keeps the puff pastry from rising and provides a crunchy, buttery pastry.)
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26
Bake pastry until puffed, browned and crisp, 15 to 20 minutes.
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27
Reduce heat to 350 degrees and bake until cooked through, 15 to 20 minutes longer.
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28
Reduce oven temperature to 275 degrees.
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29
Bake chicken mixture until sauce is bubbly around edges and chicken is just cooked through, about 30 minutes.
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30
Place baking sheet with pastry in oven to reheat the last 10 minutes of cooking.
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31
To serve: Remove parchment from Dutch oven and taste sauce.
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32
Adjust seasoning and stir in remaining lemon juice if needed.
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33
Slide pastry onto chicken mixture and display your pie.
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34
Back in the kitchen, cut the crust into wedges with a serrated knife.
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35
Spoon chicken onto warmed plates, stick a corner of a wedge into each serving and garnish with rosemary.