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1
Preheat the oven to 450 degrees.
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2
Pour the boxes of salt into a large braising pot and heat in the oven till unbearably warm to the top of the hand.
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3
Meanwhile, place the veal stock in a medium saucepan over medium-low heat, and reduce to 1 c.. Add in the lemon rind, capers, garlic, parsley, and pepper to taste.
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4
Keep hot in a warm-water bath to prevent further reduction.
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5
Trim the fillet, removing all traces of fat and silver skin between the muscles.
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6
Tie the roast with fine string at 1-inch intervals.
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7
Blanch the fresh grape leaves for 1 second in boiling water so they can bend easily.
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8
Cold them, then remove their stems and central rib.
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9
(Eliminate these steps if using canned leaves.)
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10
Roll the meat into the leaves, and tie at 1/4-inch intervals.
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11
Using a large measuring c. with a handle, transfer two thirds of the warm salt to a medium roasting pan.
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12
Arrange the meat on the bottom layer of salt, and immediately cover it with the reserved salt, to cover completely.
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13
Turn the oven temperature down to 400 degrees, and roast about 25 min.
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14
Remove the meat from the oven when it reaches an internal temperature of 110 degrees.
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15
Keep the meat wrapped in the leaves, and let rest 5 min.
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16
To serve, remove all strings and leaves, slice, and serve with the caper sauce and a garnish of stuffed mushrooms.