1. Heat oil in a large Dutch oven over medium-high heat. Add garlic and shallots; sauté 2 minutes or until golden brown.
2. Add parsley and vermouth; cook 1 minute or until vermouth has almost evaporated.
3. Stir in fish broth, and bring to a boil. Add mussels; cover and cook 2 to 4 minutes or until mussels open. (Discard any that do not.)
4. Reduce heat to low; stir in butter and next 6 ingredients. To serve, place 1 piece of bread into each of 4 shallow bowls. Spoon mussels over bread.
*Preserved lemon is available at specialty markets. If unavailable, substitute 2 teaspoons lemon zest and 1/2 teaspoon salt.