I've always presumed it was a lack of connection to the adopted land and a longing for ritual and connection. In Australia for years a Christmas Roast was the order of the day, even in heat! Now, not so much, we have adapted. We tend to celebrate occasion out in nature, as we are very connected to this landscape now..

That book looks so Interesting.. must check it out!! Thanks for sharing... you've sent me on a thought path!!!