What I miss about home is... An Gaeilge, the Irish language. It used to drive us nuts in school; some of the teachers were great and others were more fanatical that good. I miss it now...
Our office manager is Irish and sometimes we speak as gaeilge, much to the consternation of our English workmates. It's handy at Christmas too when we want to talk in front of the kids about their presents, but they know the words for money and present now...