Slice the tomatoes in half lengthwise and place them cut side up on a baking sheet lined with aluminum foil. Season them with a pinch of salt and black pepper.
Place the baking sheet in the oven and roast for 60-70 minutes.
Heat the olive oil in a large stockpot on medium heat.
Add the garlic, onion, and bell pepper and saute for 5-7 minutes until softened, stirring occasionally.
Pour in the wine and let simmer rapidly for 1-2 minutes until reduced.
Add the broth, roasted tomatoes, potatoes, smoked paprika, cayenne pepper, ¾ teaspoon salt, and ½ teaspoon black pepper and stir. Bring the liquid to a simmer and let cook for 15 minutes.
Add the cod and simmer for 3 minutes.
Gently stir in the shrimp, smoked clams, and smoked whitefish, and simmer for 3-4 more minutes until the shrimp are opaque and the smoked fish is heated through. Break up the cod and whitefish into small pieces with a fork towards the end.
Remove the pot from the heat, taste and adjust for salt, black pepper, and cayenne pepper, and serve hot topped with optional chopped parsley.