The one who gets the bread loaf with the concealed coin on Christmas Eve will be fortunate, but where is this a tradtion?

Explanation

For the Christmas meal in the Republic of Macedonia and Bulgaria, a coin is concealed in a bread loaf. It is believed that the one who gets the coin will be fortunate. The dinner is according to the rules of fasting: fish, baked beans, sauerkraut, walnuts and red wine are common. The table is usually not cleared after the dinner and until the next morning, to leave some food for the holy spirits.