It is made with flour and yeast and stuffed with pork loin, spicy chorizo, and hard-boiled eggs.

In Salamanca, it is traditionally eaten in the field during the "Monday of the Waters" (Lunes de aguas) festival.

The name of this unique festival supposedly comes from a twisting of the word enagua ("petticoat"), which the prostitutes of the town used to wear under their dresses.

According to tradition, during Lent the prostitutes were sent to the other side of the Tormes River so that the men of the town were not distracted during the religious observances.

In some parts of Spain a bollo de hornazo is a sweet and dry bread which is decorated with hard-boiled eggs.