I'm probably one of the few mexicans who grew up eating authentic italian food. My grandfather owned 12 italian restaurants in L.A., mostly in Beverly Hills.
That motherfucker wouldn't be caught dead eating sauce from a jar, that shit had to be from scratch. Pork, beef, straight tomatoes, basil, and garlic. Maybe some red vino splashed in from time to time, but that's it. People wanna put mushrooms or carrots in there, or other wild as 'imaginative' ideas, but that's bullshit. Always served with garlic bread and a Caesar's salad.
I have close friends who are Italians from Chicago, and these motherfuckers make they're sauce with the same ingredients, they just cook it over a longer period of time and sometimes even bake it to change the consistency.
Oh yeah, and they don't call that shit 'sauce'....it's 'gravy'.