01 - Melt butter with olive oil in a large saucepan over medium heat. Add onion, celery, carrot, and garlic. Sauté until soft and fragrant, about 4–5 minutes.
02 - Stir in the tomato paste, cayenne, paprika, and bay leaf. Cook for another 2 minutes to develop flavors.
03 - Pour in the white wine and simmer for 2 minutes, scraping up any brown bits from the bottom of the pan.
04 - Add the seafood or fish stock, bring to a gentle boil, then reduce heat and simmer uncovered for 15 minutes.
05 - Add shrimp and scallops to the pot. Cook until just opaque, 3–4 minutes. Remove shrimp and scallops, chop coarsely, and set aside.
06 - Puree the soup with an immersion blender (or in batches in a regular blender) until smooth.
07 - Return the soup to the pot. Stir in heavy cream, lemon juice, and chopped seafood (shrimp, scallops, and crab meat). Simmer 5 minutes; season with salt and pepper to taste.
08 - Serve hot, garnished with fresh chives or parsley.