Greece's New Year's Eve tradition of cutting a cake containing a hidden coin is called Vasilopita.
Vasilopita is a New Year's cake named after Saint Basil, or Agios Vasilios. A coin is baked into the cake, and the person who receives the slice containing it is traditionally thought to receive good luck for the coming year.
The cake is commonly cut after midnight or on New Year's Day. The household or organization may allocate the first slices symbolically to Christ, the home, or Saint Basil before serving individuals, although customs vary by region and family.
Vasilopita is not one single standardized recipe. It may resemble a sweet bread, sponge cake, or citrus-flavored cake depending on local practice. It should also be distinguished from tsoureki, a braided Greek Easter bread, which is a separate traditional food.