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1
Rinse lamb and pat dry; trim off excess surface fat. With a small, sharp knife, cut slits about 1/2 inch wide and deep all over lamb and insert slivers of garlic.
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2
In a 9- by 13-inch noncorrosive baking dish or large bowl, mix wine, olive oil, lemon juice, sherry, thyme, rosemary sprigs, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Add lamb and turn to completely coat with marinade. Cover the lamb and chill, turning occasionally, at least 2 hours or up to overnight.
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3
Lift lamb from marinade and spread out flat on an oiled barbecue grill over a solid bed of medium coals or medium heat on a gas grill (you can hold your hand just above grill level only 4 to 5 seconds). If cooking over charcoal, drop rosemary sprigs from marinade onto coals for aromatic smoke, if desired. Discard marinade. Close barbecue lid. Cook lamb, turning once, until a thermometer inserted in center of thickest part registers 135u00b0 for medium-rare (still slightly pink; cut to test), 20 to 35 minutes; thin parts will be well done.
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4
Transfer lamb to a rimmed cutting board or platter, cover lightly with foil to keep warm, and let stand 10 to 15 minutes. Slice meat thinly and sprinkle with salt and pepper to taste.
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5
Note: Nutritional analysis is per serving.