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1
Preheat the oven to 300F.
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2
Put the olive oil in a roasting pan or a large, ovenproof saute pan and place over high heat.
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3
Season the brisket generously with salt and pepper.
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4
When the oil is hot, gently sear the meat on all sides until good and golden brown.Remove meat from the pan and set aside on a serving platter.
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5
Add the garlic, onion, carrot, and celery to the pan and cook for 2 minutes, still on high heat.
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6
Add the rosemary and a bit more salt and pepper.
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7
Add the butter and cook until melted.
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8
Lower the heat to medium and sprinkle in the flour.
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9
Cook for 2 minutes, stirring constantly.
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10
Add the red wine, raise the heat to high, and cook for 2 minutes, scraping the bottom of the pan so the ingredients do not stick.
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11
Add the tomatoes, crushing them a bit with your handsyes, your handsas you put them into the pan.
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12
Add the chicken stock and the quartered button mushrooms, and stir everything around in the pan.
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13
Add porcini mushrooms (sliced, if the pieces are very large) along with their soaking liquid.
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14
Return the brisket to the pan and cover with the lid or aluminium foil.
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15
Place in the oven and braise gently for 2 to 3 hours, checking occasionally to make sure the liquid is not boiling.
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16
The meat should be very tender, almost falling off the bone, and the sauce will have thickened slightly.
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17
Turn off the heat, but leave the pan undisturbed inside the oven for 30 minutes.
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18
Remove the meat to a cutting board, slice across the grain into thin slices, and arrange on a serving platter.
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19
Garnish with the sauce and vegetables from the pan and serve.