"The addition of celery root is a great twist on the familiar flavors in this dish...."
INGREDIENTS
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2 tablespoons vegetable oil
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1 1/2 pounds skin-on, bone-in chicken thighs
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Kosher salt, freshly ground pepper
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8 medium carrots (about 1 lb.), peeled, cut into 2" pieces
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1 small celery root (about 12 ounces), peeled, cut into 1/2" pieces
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1 medium onion, chopped
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1 leek, white and pale-green parts only, chopped
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1/4 cup (1/2 stick) unsalted butter
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1/4 cup all-purpose flour
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1 cup dry white wine
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4 cups low-sodium chicken broth
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4 sprigs thyme
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1 sprig rosemary
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2 bay leaves
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1 1/2 teaspoons (or more) Sherry vinegar
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2 1/4 cups all-purpose flour plus more
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2 teaspoons kosher salt
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3/4 teaspoon baking powder
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1/2 cup (1 stick) cold unsalted butter, cut into 1/2" cubes
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3/4 cup buttermilk
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2 tablespoons crème fraîche or sour cream
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2 tablespoons chopped fresh chives
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1 large egg, beaten to blend