Wikibooks Cookbook has a recipe/module on Neapolitan sauce

Neapolitan sauce is the collective name given (outside Italy, particularly in the U.S.) to various basic tomato-based sauces derived from Italian cuisine, often served over pasta and then sprinkled with grated Parmesan cheese. Most recipes contain garlic and onions. basil, bay leaf, thyme, oregano, peppercorns, cloves, and mushrooms may be included depending on taste preferences.

The sauce is a mainstay of Southern Italy as meat was traditionally scarce, with Bolognese sauce being attributed to the North.