A houseguest surprised us with a 'loaf' of pan de cádiz. This variation on the indispensable Christmas turrón has distinctive layers of egg yolk, sweet potato, and marzipan. It's called "bread of Cádiz" because after being made, it is baked in the oven, like bread.
It was super sweet and super dense, but perfect in tiny bites. No Spaniard is caught dead without one of these at their Christmas table. This is one of the things I like most about being a foreigner...watching the things everyone does just 'because'. When it involves layers of sweet marzipan, who needs a reason?