Hermione sighed, again, and put on her lecturing voice.  "There’s this history of presidents being sent turkeys for Thanksgiving, which is a U.S. holiday to celebrate being thankful and something about Native Americans saving the Pilgrims from a desolate winter - but I don’t have the patience for  that nuanced discussion right now.  Anyway, you just need to know that turkeys and Thanksgiving are like butterbeer and wizarding pubs, they go together but it’s not everyone’s choice of drink.  So, there was this one president, John F. Kennedy, and he was sent a turkey that he was supposed to eat and he decided not to.  Then twenty or so years later a different president, Ronald Reagan, introduced the first actual "pardoning’ when he was presented with an official turkey.  It’s been a thing ever since."