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1
Preheat the oven to 400.
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2
Heat the 2 tablespoons of butter in a small skillet over medium heat.
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3
When it melts, whisk in the flour and cook for 1 minute, then whisk in the stock and milk.
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4
Season with salt and pepper, cook for a couple of minutes until thickened, then stir in the mustard; remove from the heat.
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5
Combine the chicken, scallions, peas, carrots, and dill in a mixing bowl.
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6
Pour the sauce over the mixture and stir to combine.
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7
Grease a baking sheet lightly with butter; dust your work surface lightly with flour and roll out one sheet of dough to the thickness of a nickel, and cut into quarters.
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8
Cut each quarter into 2 triangles.
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9
Transfer the triangles to the baking sheet and make 8 more triangles with the second sheet of dough.
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10
Divide the filling among 8 triangles on the baking sheet, leaving a little room at the edges to seal the pockets.
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11
Brush the edges with egg wash and place a second triangle on top; press the edges to seal or crimp with the tines of a fork.
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12
Brush the tops of the pockets with more egg wash and cut a small x in the top of each one to vent.
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13
Bake for 20 minutes, or until deeply golden and crisp; serve hot.