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1
Prepare the pastry: In a large bowl, combine flour with butter and salt.
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2
Mix lightly with your fingertips until butter forms peasized pieces.
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3
Whisk together egg and 1 tablespoon of the water.
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4
Add to flour mixture all at once, mixing gently with your fingertips.
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5
You should be able to see chunks of fat, and the pastry should be moist enough to begin to stick together.
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6
If the pastry is too dry, add up to 2 more tablespoons of water.
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7
Turn the pastry out onto a lightly floured work surface, dust with flour, and knead it until the pastry is smooth, about 3 to 4 times.
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8
Transfer to a plastic bag and form pastry into a disk.
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9
Refrigerate a minimum of 30 minutes, or as long as 3 days.
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10
Meanwhile, heat 2 tablespoons of the oil in a casserole or Dutch oven.
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11
Add the steak and kidneys, season with salt and pepper, and cook, stirring, until just browned, about 3 minutes.
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12
Remove to a plate and reserve.
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13
Add 1 more tablespoon of oil to casserole, and add mushroom quarters.
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14
Cook over high heat, stirring, until light brown.
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15
Reserve on plate with meat.
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16
Add the remaining oil to the casserole, and add onions.
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17
Cook until well browned, about 5 minutes.
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18
Sprinkle the flour over the onions and stir so that the juices soak up the flour.
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19
Cook, stirring constantly, about 1 to 2 minutes.
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20
Stir the Worcestershire sauce into the hot water, and pour over the hot onion mixture while whisking.
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21
Add the reserved meats and mushrooms, and any juices that have collected, and season with salt and pepper.
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22
Reduce the heat to low and simmer 3 to 4 minutes or until slightly thickened.
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23
Preheat oven to 400 degrees F. Roll out the pastry to a thickness of 1/4inch.
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24
Fill a 9inch pie dish with the steak and kidney mixture.
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25
Dampen the edges of the dish with water, then fit the pastry on top, pressing it down well all around the edge to seal.
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26
Make a steam hole in the center, brush the top with milk and sprinkle with sea salt and freshly cracked black pepper.
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27
Bake for 25 minutes, or until pastry is golden.
