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In a large pot over medium heat, add olive oil, onion, leek, and fennel. Stir for 5 minutes.
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Add garlic, red pepper flakes, salt, and black pepper. Saute for another 5 minutes.
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Add the crushed tomatoes, tomato paste, and white wine. Let the white wine reduce to half then add the stock and bay leaf.
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Bring stock to a boil and add seafood in the following order based on cook time: cod, shrimp, scallops, mussels, and clams. Bring to a simmer, lower the heat, cover and cook for 10 minutes. Mussels and clams should be open when they are ready.
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Sprinkle with parsley before serving.