Get your pasta water going first. Add 2 teaspoons of salt — it should taste like the sea. Cook the spaghetti until just al dente, it finishes in the sauce. Before you drain it, pull out 1½ cups of pasta water and set it aside. You'll need it.
1 pound spaghetti, Salted water for boiling, 1 ½ cups reserved pasta water
In a large sauté pan over medium-high heat, warm the olive oil. Add the garlic and red pepper flakes and cook until fragrant, about 30 seconds. Watch it closely — garlic burns fast and bitter garlic will ruin the sauce.
¼ cup extra virgin olive oil, 6 garlic cloves, 1 teaspoon red pepper flakes
Pour in the white wine and let it bubble and reduce for 2 minutes. Then add the San Marzano tomatoes, basil, oregano, Calabrian chili paste, salt, and pepper. Drop the heat to low and let the sauce simmer for 10 minutes, stirring occasionally.
¾ cup dry white wine, 1 28-ounce can crushed San Marzano tomatoes, 1 ½ teaspoons kosher salt, ½ teaspoon black pepper, 2 teaspoons dried oregano, 1 teaspoon Calabrian chili paste, 2 ½ tablespoons fresh basil
Nestle the clams and mussels into the sauce and cover the pan. Cook for 5-7 minutes. They're done when the shells open. Any that stay shut get discarded — no exceptions.
16 mussels, 10 littleneck clams
Add the shrimp and calamari, seasoned with salt and pepper. Two to three minutes is all they need. The shrimp should be pink and the calamari just tender. Pull them off the heat the second they're done — calamari goes rubbery fast.
16 large shrimp, 10 ounces calamari, ½ teaspoon black pepper, 1 teaspoon kosher salt
Add the spaghetti straight into the sauce and toss everything together. Stir in the butter, then add pasta water a splash at a time until the sauce coats every strand. Plate immediately and finish with fresh parsley and a squeeze of lemon.
3 tablespoons butter, 2 tablespoons fresh parsley, Freshly grated Parmigiano Reggiano, Fresh lemon juice