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1
Preheat the oven to 450F.
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2
Place the chicken in a round 3-quart ovenproof tureen.
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3
Core the tomato, cut into eighths, and remove the seeds.
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4
In a medium saucepan, bring the broth to a boil and reduce to a simmer.
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5
Add the carrots, turnips, onions, string beans, and peas and cook for 3 minutes.
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6
Strain, reserving the broth.
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7
Cool the vegetables under cold running water, and drain.
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8
Add the vegetables and tomato (and frozen peas, if using) to the tureen.
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9
Dot with butter and sprinkle with the optional truffle.
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10
Season with salt and pepper.
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11
Roll out the puff pastry on a lightly floured cold surface, to about a 3/16-inch thickness.
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12
Cut out a circle of pastry about 2 inches larger than the diameter of the tureen.
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13
Brush the circle lightly with the beaten egg.
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14
Fit it over the tureen, brushed-side-down, pressing the overhanging pastry against the sides of the tureen.
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15
Brush the top side lightly with additional egg.
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16
Bake for 10 minutes.
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17
Carefully cover the pastry loosely with heavy aluminum foil and continue baking for 35 minutes until puffed and golden brown.
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18
Turn the oven off.
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19
Leave the tureen in the closed oven for 20 minutes, then remove.
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20
Bring the tureen to the table and carefully cut off the crust, just inside the rim.
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21
Set the crust aside.
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22
Remove the bird and carve it on a separate platter.
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23
Serve in warm soup plates with the vegetables, juices, and a bit of the crust.