In Greece's Vasilopita tradition, a coin is hidden inside the New Year's cake.
Vasilopita is named for Saint Basil, whose feast day is celebrated on January 1 in the Greek Orthodox calendar. Families cut the cake at the start of the new year, often assigning portions to the household, absent relatives, guests, and Saint Basil. The person who finds the concealed coin is traditionally believed to receive good luck during the coming year.
The cake may be sweet and flavored with ingredients such as citrus or spices, although recipes vary by region and family. The coin is wrapped or otherwise placed carefully so it can be found without being swallowed. Vasilopita is sometimes confused with Christmas cake because it may be prepared during the holiday season, but its central ritual is specifically tied to New Year's Day and Saint Basil.