This lightly sweet brioche is the coffee cake of Alsace (where it is also known by its German name, kugelhopf). It can be baked in an eight- or nine-cup crown-shaped kouglof (or kugelhopf) mold, a fluted ring mold, or a tube or Bundt pan. While the cake is best on the same day it is baked, leftovers are delicious toasted.