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1
Preheat the oven to 400 degrees F. Line 2 large baking sheets with parchment paper and set aside.
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2
In a large skillet, cook the sausage until browned over medium-high heat, about 7 minutes.
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3
Remove from the pan with a slotted spoon.
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4
Add the oil to the pan and when hot, add the onions garlic, and cayenne and cook, stirring, until soft, about 3 minutes.
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5
Remove from the heat and let cool.
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6
When cool, add the sausage to the pan and stir well to combine with the onions and garlic.
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7
In a small bowl, beat together the egg and water to make an egg wash and set aside.
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8
On a lightly floured surface, roll out 1 sheet of the pastry to a large square, about 15 by 15 inches.
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9
Trim the edges to make even and cut the pastry in half.
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10
Using the back of a spoon or a rubber spatula, spread 1/2 of the pastry with the mustard and evenly top with 1/2 of the sausage mixture and 1/2 of the cheese.
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11
Paint the remaining pastry half with the egg wash and place, egg wash side down, over the sausage and cheese to completely cover.
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12
Press the 2 halves firmly together and using a pizza wheel or thin sharp knife, cut into 1/2-inch wide strips.
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13
Arrange the strips on 1 of the prepared baking sheets Repeat with the remaining ingredients and bake until golden brown and risen, about 15 minutes.
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14
Let cool on the baking sheets.
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15
Serve warm.
