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View Gallery Photo: Jean-Luc Barde

When I said good-bye to America many years ago and ran off with my new wife to live and write in Paris, I had never tasted cassoulet—the savory ragout of meats and white beans that is probably the emblematic dish of southwestern France's Languedoc region. In Paris, though, we were invited to lunch one Sunday by a large French family we had come to know well—and our hosts assured us that we were in for a treat because Alain, a doctor who had married into the family, was preparing his version of this hearty classic concoction.

A longtime resident of Paris, Alain had no roots in the Languedoc. He had pieced together his recipe over the years, from cookbooks and from his own kitchen creativity. Yet when the steaming casserole arrived on the table, brimming with flavorful white beans, tender duck confit, and garlicky sausages, it was a masterpiece—and for me the onset of a passion for cassoulet that has yet to be sated.

One winter day not long ago, I decided to journey to the Languedoc and discover for myself the secrets of the region's greatest gift to French gastronomy. And with all due respect to Alain, it was there, in a nondescript village in southernmost France, that I discovered how good, and how satisfying, great cassoulet can be.

Cassoulet is typical of the hearty, rustic cuisine of the Languedoc's vast plain; the local poultry and sausages (along with lamb, mutton, and Mediterranean fish) are found in numerous local dishes, accompanied by plenty of garlic and tomato. The specialty is historically associated with three ancient cities—Toulouse, Castelnaudary, and Carcassonne—that lie along the tree-lined Canal du Midi, part of a longer waterway linking the Atlantic and the Mediterranean. Traditionally, each of these towns has its own version of the dish, though it is generally acknowledged that cassoulet had its beginnings in Castelnaudary. Convention has it that the cassoulet of Castelnaudary is based largely on pork and pork rind, sausage, and (sometimes) goose; the Carcassonne variety contains leg of mutton and (occasionally) partridge; and the cassoulet of Toulouse includes fresh lard, mutton, local Toulouse sausage, and duck or goose. Prosper Montagné, a celebrated turn-of-the-century French chef, wrote that cassoulet was the "God" of Occitan—southern French—cuisine, with three incarnations: "God the Father, which is the cassoulet of Castelnaudary; God the Son, which is that of Carcassonne; and the Holy Spirit, which is that of Toulouse." But not all commentators appreciated all three regional variations. In his Histoire comique, Anatole France spoke with great warmth of a restaurant in Paris where a Castelnaudary-style cassoulet had been simmering in the same pot for 20 years—but, he added, this "must not be confused with cassoulet in the style of Carcassonne, a simple leg of mutton with beans".

In my own travels along the cassoulet trail, I've found that the differences between the three varieties seem to have blurred over the years. Although the chefs of Carcassonne often add a small piece of tender lamb as an apparent bow to tradition, I have never found lamb or mutton in a cassoulet served to me in Toulouse—and in Castelnaudary, where a robed order of cassoulet guardians has sprung up to jealously protect the reputation of the city's most famous dish, it is considered perfectly proper to add sausage from Toulouse.

"There are three secrets to a good cassoulet," Georgette Diomard, owner of a small food shop in Villefranche-de-Lauragais, a town midway between Toulouse and Castelnaudary, told me. Diomard supplies essential ingredients, as well as lashings of advice, to Villefranche's cassoulet aficionados. "First, the beans. They must be well cooked but not so much that they get mushy. Second, one must use a sufficient quantity of pork rind when making the bouillon, which renders it thick and smooth." Finally, Diomard told me, the cassoulet must be baked in the oven for several hours in a cassole, the earthenware bowl, resembling a squashed flowerpot, from which the dish got its name.

"Our sole purpose is to defend the glory and the quality of our cassoulet," Francis Charron, Grand Maître of the Grande Confrérie [brotherhood] du Cassoulet de Castelnaudary, told me when I met him one afternoon in that city. And although the organization "refuses to enter into polemics" about the different regional versions of cassoulet, he added, it is quite strict about the qualities of a Castelnaudary cassoulet. So, while restaurant owners, caterers, and even local cassoulet canners can join the brotherhood, only those who have no commercial interest in the product can aspire to be knights, the order's highest rank. "The knights are those who love cassoulet and who eat it," Charron explained. Every so often, the knights will make a surprise visit to an establishment. "For each part of the cassoulet we have our criteria, and we give an overall grade. If there's a deficiency, we will say so. Maybe it has been cooked too long, not cooked enough, it's too fatty, not fatty enough; perhaps the sausage is too big or too small." I asked Charron why he is so passionate about cassoulet. "For one thing," he replied, "cassoulet is an expression of our local civilization—a meal whose character is so typical of this region. And then, as I hope you will soon see, it is an exceptionally convivial dish."