Heat the olive oil in a large skillet or Dutch oven over medium heat.
Add the sliced garlic and red pepper flakes, sautéing for about 30 seconds until fragrant.
Pour in the white wine, letting it simmer for 3 minutes to cook off the alcohol.
Add the cherry tomatoes, salt, pepper, and Calabrian chili paste.
Let it simmer for 10 minutes, stirring occasionally, until the tomatoes break down slightly.
Cook the Seafood:
Season the shrimp and calamari with salt and pepper.
Nestle the littleneck clams and mussels into the sauce, cover, and cook for 5-6 minutes, or until they open. Remove with a slotted spoon or tongs and put the shellfish in a bowl or on a plate while we move onto the calamari and shrimp. Make sure you discard any clams or mussels that don’t open!
Add the shrimp and calamari, stirring gently. Cook for 3-4 minutes until the shrimp are pink and the calamari is tender.
Combine Everything:
Add the drained pasta to the skillet, tossing to coat in the sauce. Add unsalted butter and toss until its melted and silky.
If needed, add reserved pasta water a little at a time until the sauce is silky and clings to the noodles.
Stir in the fresh parsley and basil.
Serve & Garnish:
Divide the pasta among plates, ensuring each portion gets a mix of seafood. Drizzle with a little extra virgin olive oil and finish with a squeeze of fresh lemon juice. Serve immediately and enjoy!
Notes
Careful cooking – Don’t overcook the seafood spaghetti! Shrimp and calamari become rubbery if left too long.
Purchasing shrimp - When buying shrimp, opt for ones with heads removed but shells on for extra flavor.
Cooking liquid matters – The starchy pasta water helps the sauce cling to the spaghetti.
Use a large frying pan – A pan that’s too small will crowd the seafood and steam it instead of searing it.