In France, we celebrate (i.e. eat cake) for Kings’ day, or Epiphany, 6th of January. Usually, one large cake contains a token, and the winner becomes ‘king’ for the day.
The preferred cake in most of the country is the galette des rois, a puff pastry pie filled with almond cream or frangipane.
Unless requested, I omit the token in mine. What I don’t omit is flavour. I make the puff pastry myself with quality French butter, the filling is abundant, almondy, rich but not cloying.
I make both individual pies and family ones (30cm in diameter).