Aspecial christmas cake is passed around at christmas time in macedonia. what is usually hidden inside?

Macedonia is a mountainous country in Europe where lots of  Orthodox Christians live. Christmas is celebrated on January 7th because the Orthodox Church uses the 'Julian' Calendar but celebrations actually start on January 5th when people, especially children, do carols singing around their neighbors in exchange for fruits, nuts and coins. When singing finishes people gather around bonfires sometimes held in parks. Others hold smaller events where the local community gets together and traditional food is eaten such as the famous Macedonia cake with a coin inside.