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1
Using a small sharp knife, make a slit on the flat side of each chestnut.
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2
Bring a medium saucepan of water to a boil over high heat.
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3
Add the chestnuts, return to a boil and cook for 5 minutes.
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4
Using a slotted spoon, transfer the chestnuts to a thick kitchen towel and wrap them to keep warm.
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5
One by one, cut and peel away the outer shell and dark brown skin.
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6
In a heavy medium skillet, combine the peeled chestnuts, 1 tablespoon of the butter, the fennel seeds, celery, bay leaf and enough water to cover.
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7
Bring to a boil over moderately high heat.
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8
Reduce the heat to low, cover and simmer without disturbing until the chestnuts are just tender, 20 to 35 minutes.
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9
Using a slotted spoon, transfer the chestnuts to a flat plate to dry.
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10
In a medium skillet, melt 2 tablespoons of the butter over moderately high heat.
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11
Add the bread cubes and fry, tossing, until golden brown, 3 to 5 minutes.
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12
Add the garlic and a pinch of salt and toss over the heat for 10 seconds.
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13
Drain on paper towels.
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14
In the same skillet, fry the pancetta over moderately high heat until almost crisp, 4 to 5 minutes.
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15
Add the remaining 1 tablespoon butter, the chestnuts and 1/4 teaspoon each of salt and pepper.
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16
Cook until the chestnuts are glistening, about 30 seconds.
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17
Just before serving, place the greens in a large serving bowl.
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18
In a small bowl, whisk the walnut oil with the vinegar, 1/4 teaspoon salt and 1/8 teaspoon pepper.
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19
Pour the vinaigrette over the greens, add the walnuts and toss.
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20
Fold in the warm chestnuts and pancetta and scatter the croutons over the top.
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21
Serve at once.