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Trim the leg of lamb.
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Place in a nonaluminum pan or in a large, heavy-duty plastic bag.
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Pour the buttermilk over the lamb and refrigerate for 3 to 4 days.
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Turn the lamb often if the milk does not cover it completely.
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Preheat oven to 325°F.
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Remove the lamb from the milk and discard the milk.
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Dry the meat and rub it with the salt.
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Place it on a rack in a roasting pan.
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Pour the water into the bottom of the pan.
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Insert a meat thermometer into the thickest part of the roast, being careful not to let the thermometer touch the bone.
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Roast until the meat reaches 160°F.
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Deglaze the roasting pan by adding a little water to it and stirring up the drippings from the bottom of the pan.
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Strain the drippings and blend in the flour.
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Cook, stirring, until the gravy is thickened.
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Add the sour cream, salt, and pepper.
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Slice the roast and serve with the gravy.
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10 servings.
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Scandinavian Feasts B.
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Ojakangas.