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1
In a large, heavy flameproof casserole, preferably cast iron, over medium heat, heat the olive oil and saute the onions until golden.
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2
Thoroughly dredge the beef in the flour, covering all the surfaces.
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3
Add to the pan and brown on all sides.
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4
The flour may cause the onions to burn slightly.
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5
This is good and will add lots of flavor.
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6
Add the carrots, celery, beef broth, wine, thyme, black pepper, and salt to taste.
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7
Reduce heat, partially cover, and barely simmer for 3 to 3 1/2 hours, turning the beef occasionally.
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8
Remove the carrots and celery when they are cooked and reserve.
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9
When the beef is falling-apart tende, remove it from the broth.
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10
Remove the thyme sprigs.
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11
Knead the butter and 2 tablespoons flour together until thoroughly combined.
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12
Add the mixture to the broth and stir with a wooden spoon until you have a sauce the consistency of buttermilk.
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13
Remove from the heat.
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14
To serve, slice the beef and arrange on a platter.
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15
Cover with some of the sauce.
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16
Put the remaining sauce in a bowl or gravy boat.
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17
Arrange the carrots and celery attractively on the beef platter.
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18
Garnish with fresh thyme sprigs, if you like.
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19
Serve immediately.