Clay Pot Bourride

A bourride is a French fish soup that is a lot easier to make and just as marvelous in its homey way as a classic Mediterranean bouillabaisse. A preheated earthenware casserole is filled with layers of potatoes, leeks, onions, and cubes of fish, flooded with boiling fish stock, and then covered. The fire is turned off, allowing the fish to cook in the receding heat. Just before serving, the cooking liquid is combined with a garlicky ailloli sauce (aïoli) enriched with extra egg yolks, creat