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1
Tomato base-in a 6-quart Dutch oven or stockpot, heat the oil over medium heat.
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2
Saute the onions and carrot for 5 minutes, or until softened.
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3
Add the garlic and saute for 1 minute.
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4
Add the marinara sauce, tomato paste, lemon juice, stock, wine, and sugar.
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5
Cook, partially covered, for 20 minutes, or until the alcohol has evaporated and the sauce has a nice flavor.
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6
Season with salt and pepper; cover to keep hot.
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7
In another large Dutch oven, heat 2 tablespoons oil over medium heat.
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8
Saute the clams and mussels for about 2 minutes.
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9
Increase heat to med-high and add wine.
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10
Cover and steam for about 3 minutes, or until the shells open.
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11
Transfer the shellfish and wine broth to the tomato base; discard any clams or mussels that don't open.
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12
Heat the remaining 2 tablespoons oil in the same pot over med-high heat.
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13
Sear the fish, scallops, and shrimp, and saute for about 3 minutes or until just opaque.
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14
Add the crab and cook just until heated through.
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15
Transfer all of the seafood to the tomato base and mix to coat evenly.
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16
Cook over med-high heat for about 3 minutes or until the stew simmers.
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17
Do not overcook the fish.
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18
Serve in deep bowls, garnished with the parsley and lemon slices.