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1
Soak the porcini in 1-1/2 cups boiling water for 20 minute Strain them (reserving the soaking liquid) and chop them.
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2
Heat 2 Tbs.
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3
of the oil in a large Dutch oven or heavy soup pot over medium heat.
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4
Add the pancetta or bacon and cook, stirring occasionally, until crisp, about 7 min.
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5
; transfer to a plate lined with paper towels.
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6
Season the chicken well with salt and pepper.
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7
Add half of the thighs to the pan and brown them well, 2 to 3 minute per side.
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8
Transfer to a large plate.
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9
Brown the remaining thighs and reserve with the rest.
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10
Add the onion and half of the garlic to the pan and season well with salt.
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11
Cook, stirring with a wooden spoon and scraping up any browned bits, until the onion softens and darkens slightly, about 7 minute
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12
Add the chopped porcini and cook for another 1 minute.
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13
Pour in the sherry and cook, stirring occasionally, until it's almost completely reduced, about 2 minute
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14
Add the potatoes, thyme sprigs, chicken broth, reserved porcini water, and vinegar and bring to a boil over high heat.
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15
Adjust the heat to maintain a gentle simmer, cover the pan, and cook until the potatoes are just tender, about 15 minute
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16
Discard the thyme sprigs.
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17
Puree 1-1/2 cups of the chunky potato mixture in a blender.
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18
Return the pureed mixture to the rest of the broth, nestle in the chicken (and add any accumulated juices), and cover the pot with the lid slightly ajar.
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19
Stew the chicken thighs at a bare simmer, turning them occasionally, until they're cooked through (check by slicing through the bottom of one of the thighs to the bone), about 30 minute.
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20
Meanwhile, in a large nonstick skillet, heat the remaining 2 Tbs.
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21
oil over medium heat.
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22
Add the remaining garlic, saute until it starts to color, about 20 seconds, and then add the breadcrumbs.
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23
Cook, stirring often, until they turn golden brown, about 6 minutes.
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24
Stir in 1/2 teaspoons of the chopped thyme, season lightly with salt and pepper, and transfer to a plate lined with paper towels.
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25
When the chicken is done, fold in the spinach and stir until wilted, about 1 minute.
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26
Stir in the remaining 1 teaspoons chopped thyme and the pancetta; season well with salt and pepper.
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27
Serve immediately, sprinkled generously with the breadcrumbs.