- Heat the olive oil in a large pot over medium heat. 
- Add the onion and cook until softened, about 5 minutes. 
- Stir in the garlic, red pepper flakes, and smoked paprika. Cook for another minute. 
- Mix in the tomato paste and cook for 2 minutes, letting it darken slightly. 
- Pour in the crushed tomatoes, seafood stock, and white wine if using. Bring to a boil. 
- Reduce heat and let it simmer for 20 minutes to build flavor. 
- Add the shrimp, squid, and mussels. Cover and cook until mussels open and shrimp turns pink, about 6-8 minutes. 
- Season with salt and pepper. Discard any mussels that didn’t open. 
- Serve hot, garnished with fresh parsley and lemon wedges.