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1
Put the pearl onions in a large bowl.
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2
Add carrots and potatoes to a medium pan of boiling water; simmer for about 10 minutes, or until tender; drain and add to the onions.
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3
In a skillet, melt 2 tablespoons of butter over medium heat; add in the leeks; stir/saute for 3 minutes, or until softened.
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4
Add in the mushrooms; stir/saute for 3 minutes or until softened.
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5
Add the leeks and mushrooms along with the cooking juices to the vegetables in the bowl; add in the peas, corn, and turkey; mix well and set aside.
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6
Preheat oven to 400u00b0; in a large saucepan, add the remaining 6 tablespoons butter over medium heat.
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7
Sprinkle in the flour; cook, whisking constantly, for 3 minutes or until the roux is blond colored.
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8
Slowly add the broth and half-and-half, whisking constantly, and whisk for about 3 more minutes, until the sauce is thickened and smooth.
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9
Season to taste with salt and pepper; pour the sauce over the turkey mixture; add in the herbs and mix well; taste for seasoning and adjust.
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10
Butter a 9x13 inch 2-inch deep casserole; pour the turkey mixture into the casserole.
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11
If necessary, roll out the pastry on a lightly floured surface to a 14x10 inch rectangle; brush the rim of the casserole dish with water.
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12
Cover the filling with pastry, pressing it against the rim of the dish; make 3 slashes in the pastry.
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13
Brush the crust with the beaten egg.
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14
Place the dish on a baking sheet and bake for 40-45 minutes, or until the filling is bubbling; sprinkle with parmesan cheese during the last 15 minutes of baking to brown the crust.
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15
Let the potpie stand for 10 minutes before serving.