Cauliflower is an underrated vegetable. Roasted simply with olive oil, it becomes a sophisticated and delicious side dish. In this soup, though, we give cauliflower the royal treatment, with chicken stock, cream, and nutty-tasting Gruyère cheese. A bouquet garni, the traditional French flavor bundle of herbs, infuses this recipe with an astonishing level of flavor. White pepper is a traditional seasoning for light-colored foods in French cuisine (specks of black pepper would stand out too much). Note that if the resulting soup seems too thick, you can thin it with either additional cream or plain water.