In Greece, there are many different New Year's traditions and some of them vary by location and the specific culture of the region. Most of them bring good luck and health for the new year, especially this onion tradition. Across all of Greece, families will hang a yellow onion on their door as a symbol of good luck. They will usually do this after the church service on New Year's Day. While not all families do this, you may see it next time you visit Greece in January, look out for it!