Fish stews—bouillabaisse, cioppino, chowder, bisque, fish head soup, and so on—are some of my favorite meals. Don't let the authenticity police scare you into passing on such hearty and satisfying fare. These dishes are meant to be simple, to let the ingredients speak for themselves, even when we gussy them up with pretension.

In Marseilles, partisans have been arguing over the ingredients and