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1
Sift flour and salt into a bowl.
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2
Add the butter and cut it into the flour until mixture resembles breadcrumbs.
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3
Beat the egg yolk with the water in small bowl.
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4
Sprinkle liquid onto flour mixture and combine with your fingertips.
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5
Form dough into a ball.
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6
Cover and chill for 30 minutes.
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7
Preheat the oven to 375 degrees and grease pie or quiche pan with butter.
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8
Roll out dough on floured surface and then line the pan.
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9
Prick bottom with fork and chill for 30 minutes.
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10
Line with foil and dried beans and bake in the oven for 25 minutes.
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11
Remove the foil and beans and cool on a wire rack.
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12
Reduce oven temp to 350 degrees.
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13
Melt butter in a large, heavy bottomed skillet.
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14
Add the onions, cover and cook over very low heat, stirring occasionally, for 20 minutes.
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15
Add mushrooms and thyme and cook for an additional 10 minutes, stir often.
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16
Spoon mixture into cooled tart shell and place the pan on a cookie sheet.
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17
Lightly beat the egg with the egg yolks and cream ans season to taste with salt and pepper.
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18
Pour mixture over mushroom filling and bake for 20 minutes or until the filling is set and golden.
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19
Serve hot or at room temperature.
