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Pat pork dry & score well with sharp knife.
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Combine parsley, onion, peel, basil, and garlic in a small bowl.
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Whisk in 2/3 of oil.
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Rub into pork.
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Wrap in foil and refrigerate overnight.
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Let pork stand at room temperature 1 hour before roasting.
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Preheat oven to 350 degrees F. Brush pork with remaining olive oil. Set on rack in shallow pan.
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Roast until meat thermometer inserted in thickest part of meat registers 170 degrees F, about 2 1/2 hours.
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Set meat aside.
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Degrease pan juices & Blend Sherry into pan juices.
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Cover and cook over low heat 2 minutes.
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Pour into sauceboat.
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Transfer pork to platter. Garnish with fresh parsley and lemon slices.
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Serve sauce separately.