No longer a Christmas tradition, fortunately

Fortunately for the boar and for humans who value civility, it's no longer customary to sacrifice a wild boar and present its head as a Christmas dish.  "The Boar's Head Carol" is typically one of the most forcefully sung Christmas carols despite its bizarre lyrics.  (i.e.  "The boar's head, as I understand, is the rarest dish in all this land!")  Singers also elaborate on how it will be served with bays and rosemary.  No other carol details a Christmas feast in such a manner, as far as I know, and it would be downright strange if other carols followed suit.  I'd wonder about anyone who would walk into a room singing, "These cookies, as I understand, were made with flour and marzipan!"