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1
To slice the beef into scallops: Lay one hand open on the top of the roast to hold it in place.
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2
With a sharp chefs knife, begin slicing the meat on a slant, cutting across the grain, and continue with parallel angled cuts every 1/2 inch or so, slicing the meat chunk into a dozen thin scallops.
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3
As you slice, press down lightly with your top hand, creating resistance, so you can feel the blade moving and keep the slices evenly thick.
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4
Flatten the slices into scallops one at a time.
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5
Place each one between sheets of wax paper or plastic wrap and pound it with the toothed face of a meat mallet, tenderizing and spreading it into a narrow oval, about 6 by 3 inches.
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6
When all are pounded, season the scallops with salt, about 1/2 teaspoon in all, and spread a thin layer of mustard on the top surfaces.
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7
Starting at the short end of each scallop, pile three celery sticks, three carrot sticks, and a pickle in a bundle.
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8
Roll up the meat, enclosing the vegetables, and secure it with toothpicks.
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9
When all the rolls are formed, season with the remaining salt.
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10
Spread the flour on a plate, and dredge the involtini, lightly coating them.
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11
Pour the olive oil in the pan, and set it over medium-high heat.
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12
Shake excess flour from the rolls, lay them in the pan in one layer, and cook, rotating and moving them around, until browned all over.
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13
Push the rolls to the side of the pan, and scatter the onion slices and any remaining carrot and celery sticks on the pan bottom.
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14
Drop in the bay leaves, and cook the vegetables, stirring occasionally, until theyre beginning to brown and soften, about 5 minutes.
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15
Turn the heat to high, pour in the white wine, and let it heat and bubble until almost completely evaporated.
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16
Pour in just enough broth to cover the involtini, and bring it to a boil.
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17
Set the cover ajar, and adjust the heat to keep the liquid simmering.
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18
Cook for an hour and 15 minutes, or until the beef is tender and the sauce has reduced to a consistency you like.
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19
Turn off the heat, take out the toothpicks, and remove the involtini to a warm platter.
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20
Ladle some of the pan sauce over the involtini, pour the rest into a bowl for passing at the table, and serve while hot.