-
1
Heat the oil in a large skillet over medium-high heat.
-
2
Add the onions and potatoes and cook until the onions are translucent, about 5 minutes.
-
3
Add the carrots and mushrooms and cook, stirring occasionally, until the mushrooms are tender and have released their moisture, about 5 minutes.
-
4
Add the garlic and cook until fragrant, 45 to 60 seconds.
-
5
Add the flour and cook, stirring, for 1 minute.
-
6
Add the warmed chicken stock and bring to a boil.
-
7
Reduce the heat and simmer until thick and bubbly, about 7 minutes.
-
8
Add the chicken meat and tarragon; taste and adjust the seasoning with salt and pepper.
-
9
Transfer the chicken mixture to a large casserole dish; set aside to cool slightly.
-
10
Heat the oven to 400 degrees F. Remove the pie crust dough from the refrigerator.
-
11
Dust a clean surface lightly with flour and roll the dough out to form a 12- by 8-inch rectangle, about 1/8-inch thick.
-
12
Transfer the dough to the top of the casserole dish.
-
13
Press the dough onto the sides of the dish to seal the edges.
-
14
Using a paring knife, cut several slits in the top of the crust to allow steam to escape while baking.
-
15
Bake until golden brown, about 45 minutes.
-
16
Let stand 10 minutes before serving.
-
17
Combine the flour and salt in the bowl of a food processor fitted with the blade attachment.
-
18
Add the butter and vegetable shortening and process until the mixture resembles coarse meal, 8 to 10 seconds.
-
19
Add enough of the ice water, 1 tablespoon at a time, pulsing between additions, until the dough holds together without being sticky or crumbly.
-
20
Remove the dough from the processor and shape it into a disk.
-
21
Wrap in plastic wrap.
-
22
Chill until firm and the moisture has distributed evenly, about 30 minutes.
-
23
Dust a clean work surface and a rolling pin with flour.
-
24
Place the disk of dough in the center of the floured surface.
-
25
Starting in the center of the dough, roll to, but not over, the upper edge of the dough.
-
26
Return to the center, and roll down to, but not over, the lower edge.
-
27
Lift the dough, give it a quarter turn and lay it on the work surface.
-
28
Continue rolling, repeating the quarter turns, until you have a disk about 1/8 inch thick.
-
29
Wrap in plastic and refrigerate until ready for use.
-
30
Yield: 1 disk