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1
To prepare the mushrooms, heat the butter and oil in a large, heavy-bottomed skillet over medium heat until shimmering.
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2
Add the mushrooms and saute until soft and all the liquid in the pan has evaporated, about 5 minutes.
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3
Add the shallot and cook until translucent, about 3 minutes more.
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4
Add the herbs and nutmeg.
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5
Taste and adjust for seasoning with salt and pepper.
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6
Set aside to cool.
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Line a baking sheet with a silicone baking sheet or parchment paper.
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8
In a small bowl, whisk together the egg and the water to make a wash; set aside.
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9
To prepare the pastry, on a lightly floured surface, roll out the puff pastry to a 12 by 15-inch rectangle.
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10
From it, cut one 12 by 5-inch rectangle, two 11 by 1/2-inch strips, and two 5 by 1/2-inch strips.
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11
Place the rectangle on the prepared baking sheet and prick all over with a fork.
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12
Brush all the pastry strips with the egg wash.
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13
To form the pastry shell, place the short pastry strips, egg-wash side down, along the edges of the short sides of the pastry; place the long strips, egg-wash side down, along the edges of the long sides of the pastry.
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(Dont worry about making all of this very exact: the goal is to create a rim to contain the mushrooms.
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For a more rustic look, leave the 12 by 15-inch rectangle intact, and simply create a rim by folding over all 4 edges, and seal with egg wash.) Chill until firm, about 10 minutes in the freezer or 30 minutes in the refrigerator.
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16
Preheat the oven to 400F.
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Bake the tart shell until golden, about 15 minutes.
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Remove from the oven and spread the cheese evenly over bottom of the hot shell.
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Top with the reserved sauteed mushrooms.
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Return to the oven and continue to bake until heated through, about 10 minutes.
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21
Remove from the oven and let cool slightly.
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22
Cut into strips and serve.
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23
The mushrooms can be prepared completely in advance and reheated.
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24
The tart shell can also be prepared to the point of chilling the raw dough.
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So, all you would need to do before serving is prebake the shell, fill, and finish baking.