- 1 large onion, halved lengthwise
- Rounded 1/4 teaspoon crumbled saffron threads
- 3/4 teaspoon salt
- 3 tablespoons olive oil
- 1 cup dry white wine
- 1 cup heavy cream
- 1/4 teaspoon black pepper
- 4 lb cultivated mussels, rinsed well
- 2 tablespoons chopped fresh flat-leaf parsley
- Special equipment: an adjustable-blade slicer
- Accompaniment: prepared garlic bread
- Cut onion halves crosswise into less than 1/16-inch-thick slices with slicer.
- Cook onion with saffron and 1/2 teaspoon salt in oil in a wide 6- to 8-quart heavy pot over moderately high heat, covered, stirring occasionally, until onion is softened, about 5 minutes.
- Add wine and bring to a boil, then stir in cream, pepper, remaining 1/4 teaspoon salt, and mussels. Cook, covered, checking after 6 minutes and transferring opened mussels to soup bowls with a slotted spoon. (Discard any that remain unopened after 8 minutes.)
- Stir parsley into broth and pour over mussels.