Today is a holiday across Spain as everyone celebrates the day of the The Kings. This morning children will have woken early to find presents left by the Kings, hopefully as requested in the letters they sent them.
The cake of the day is the Roscon de Reis, which is a pastry/dough ring filled with cream or something similar and decorated, often with candied fruit. Hidden in the cream will be a small figure of one of the Kings and a (broad) bean. Whoever finds the bean has to pay the bill, while the person that gets the figure if the king is king for the day.