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1
Preheat the oven to 375.
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2
Season the veal shanks with salt and pepper.
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3
In a very large, deep skillet, heat 3 tablespoons of the olive oil until shimmering.
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4
Working in batches, cook the veal over moderately high heat until browned on both sides, about 8 minutes total per batch.
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5
Transfer the osso buco to a large roasting pan.
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6
Add the remaining 3 tablespoons of olive oil to the skillet.
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7
Add the diced carrots, celery, onions, 4 whole garlic cloves and the bay leaves and cook over moderate heat until they are softened, about 12 minutes.
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8
Add the chicken stock, white wine, diced tomatoes and thyme sprigs and bring to a boil.
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9
Pour the vegetables and liquid over the veal, cover the roasting pan with foil and transfer to the oven.
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10
Braise the shanks for about 2 1/2 hours, until very tender.
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11
Meanwhile, in a small bowl, mix the orange zest, lemon zest, parsley and the 2 minced garlic cloves.
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12
Lightly season the gremolata with salt and pepper.
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13
Transfer the veal shanks to a baking sheet and cover with foil.
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14
Carefully strain the cooking liquid into a large bowl.
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15
Reserve the vegetables; discard the bay leaves and thyme sprigs.
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16
Pour the cooking liquid back into the roasting pan and boil over high heat until it is reduced by half, about 25 minutes.
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17
Season the sauce with salt and pepper.
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18
Stir in the reserved vegetables and simmer over moderately low heat for 2 minutes.
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19
Transfer the osso buco to shallow bowls.
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20
Spoon the sauce and vegetables on top and sprinkle lightly with the gremolata.
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21
Serve with the remaining gremolata at the table.