1. Place a large heavy-bottomed soup pot or Dutch oven over high heat. Season halibut, salmon and shrimp with salt and pepper. When pot is hot, add 1 tablespoon extra-virgin olive oil and sear the halibut on two sides; remove and repeat with the salmon. Next, add shrimp to pot, sauté 1 minute and remove. Set all seared seafood on a plate and refrigerate. 2. Lower heat to medium and add the remaining tablespoon of extra-virgin olive oil. Add onion, celery, fennel, garlic and chiles, and cook 5 to 7 minutes. Pour in wine and cook until reduced by half. 3. Add fish stock or clam juice, tomatoes, thyme, saffron and bay leaf; mix well and bring to a boil. Reduce heat and simmer 30 minutes. Check seasoning. (Preparation of the broth can be done 1 to 3 days ahead.) 4. When ready to serve, bring mixture to a boil. Place fish, shrimp, clams and mussels in a single layer in pot and cover with lid. Reduce heat and simmer 4 to 5 minutes, or until clams and mussels have opened. Add basil, stir gently and check seasoning. Serve hot with a loaf of crusty bread and olive oil.
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