The Day of Kings (el Dia de Reyes), or Epiphany, is celebrated on January 6 to commemorate the day the magi arrived bearing gifts for the infant Jesus. The Day of the Kings is observed by Latin cultures with the making and eating of a rosca de reyes, a sweet yeast bread similar to Louisiana's King cake, with a hidden tiny plastic baby (or a dried bean), representing the baby Jesus, inside. If you get the slice with the "baby", you will have good luck all year. The Solo filling is generally found in the supermarket near the pie fillings. From the Texas Monthly magazine. Prep time includes rising time.