Add onion and cook for 6–8 minutes, stirring occasionally ... Mix until smooth and fully combined. Season with salt and more pepper if needed. Toss the cooked spaghetti with the sauce mixture, adding ...
Add the onion and cook for 5–8 minutes ... then stir in the parsley. Season with pepper, and salt if needed (the anchovies will be salty). Serve the pasta in warmed bowls, with Parmesan ...