A lucky coin is traditionally hidden inside Greece's New Year's Eve vasilopita cake.
Vasilopita is a Greek New Year's cake named for Saint Basil, whose feast day is celebrated on January 1 in the Greek Orthodox tradition. Before baking, a coin called the flouri is concealed in the cake. When the cake is cut and served around New Year's Day, the person who finds the coin is believed to receive good luck for the coming year.
Families often make the first slice symbolically for Christ, Saint Basil, the household, or the home before serving slices to individuals. Customs differ by region and family, so the order of cutting is not universal.
The coin is not an ingredient intended to be eaten. It is wrapped or placed carefully so that it can be discovered safely, and modern celebrations may substitute a coin-shaped token.