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1
Combine 1 1/2 cups onion, wine, mussels, and 3 parsley sprigs in a Dutch oven; bring to a boil over medium-high heat. Cover and cook 2 minutes or until mussels open; discard any unopened shells. Remove mussels with a slotted spoon; set aside. Strain cooking liquid through a sieve into a bowl, reserving liquid, and discard solids. Remove meat from mussels. Discard shells.
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2
Place Dutch oven over medium heat; melt butter. Add 1 1/2 cups onion, fennel, and leeks; cook 10 minutes or until tender, stirring occasionally. Combine water and bouillon, stirring until bouillon cubes dissolve. Add bouillon mixture and reserved cooking liquid to onion mixture, stirring to combine.
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3
Place the remaining 3 parsley sprigs, thyme, and bay leaf on a double layer of cheesecloth. Gather the edges of the cheesecloth together, and tie securely. Combine the cheesecloth bag and broth mixture; bring to a boil. Reduce heat, and simmer 10 minutes. Remove bag, and discard.
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4
Combine the half-and-half, creme fraiche, and egg yolks in a medium bowl, stirring well with a whisk. Gradually add 1 1/2 cups hot broth mixture to egg mixture, stirring constantly with a whisk. Return egg mixture to pan. Cook 5 minutes or until soup thickens slightly (do not boil), stirring constantly. Add fish and scallops; cook 5 minutes or until fish is done, stirring frequently. Stir in mussels, 1/4 cup chopped parsley, and lemon rind; cook 1 minute or until thoroughly heated. Stir in salt and pepper.
