In the spirit of fairness and ecumenanism, sundown last Friday, September 22 was also Rosh Hashanah for all Jews. One of the most important observations of the year.
You could wish them L'shanah tovah tikatev v'taihatem ("May you be inscribed and sealed for a good year") and in turn you may have been offered apple slices dipped in honey... At sundown the Shofar (a ram's horn) would have inititated the celebration of the head of the year or New Year...Shalom! l'shanah haba'ah Yirushalayim!
Clanad if you look further down this page you will see that i did exactly that, though i had initially put it in the suggestions thread but it was zapped by the bigoted idiots on friday night : (