In a large saucepan, combine browns sugar, allspice, cloves, salt, nutmeg, cinnamon, and apple or pineapple juice.  Slowly bring the mixture to boiling.  Reduce heat; cover and simmer ofr(sic) 20 minutes.  Stir in rum; return just to boiling.  Remove from heat; pour through strainer to remove whole spices.  Place pat of butter or margarine in each of eight mugs.  Pour in the hut rum mixture.  Makes 8 servings.