Hidden in its interior, or under a slice, is a small plastic baby. Whoever finds it must either bring the next cake or throw a party, thus sparking an unending round of food and fun. Whether at the workplace, school or home - king cake is a gift that keeps on giving throughout the Mardi Gras season.

The traditions of the King Cake, celebrated from Epiphany (January 6) through Mardi Gras, revolve around the "fève" or hidden trinket (usually a small plastic baby). The primary rule is that the person who finds the baby in their slice is crowned "King" or "Queen" for the day and is granted good luck. However, this honor comes with a specific responsibility: the "winner" is obligated to buy the next king cake or host the next party of the season. In traditional French settings, the youngest child often goes under the table to call out names for each slice to ensure a fair and random distribution. Another rule: king cakes should never be sold or eaten outside of the Carnival season; doing so is considered bad luck in New Orleans and other regions that observe these festive traditions.