Christmas in some European countries kicks off 12 more days of religious observance — the famous Twelve Days of Christmas. They end today (January 6) with the Epiphany holiday, when the Three Wise Men were said to have finally brought their gifts to the baby Jesus.

France, not surprisingly, celebrates Epiphany in an edible way. For several days from Christmas until the Feast of Epiphany, the French line up at bakeries to buy the galette des rois — the “Cake of Kings.”...