When I was a child, DF worked Christmas Eve so it was DM's choice - port and shortbread.
A friend and I engaged in some mild class warfare when she heard this - her family put out beer and TimTams (Australia).
I had never heard of leaving anything for the reindeer until MIL presented DD with some shit glittery oats sparkly reindeer food last year
DH thinks Father Christmas would like whiskey this year, and carrots for the reindeer.
What does he eat at yours?