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Mix together butter, brown sugar, and mustard powder.
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Bake ham, wrapped in heavy paper towel, for 2 hours at 325 degrees. Remove paper towel; cut off fat, then score the ham.
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Rub butter mixture all over the ham.
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Stir bourbon and orange juice together.
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Pour half of the o.j. and bourbon over the ham.
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Continue to bake ham another 45 minutes, basting every 15 minutes with remaining o.j. and bourbon.