@amolith Of course I'd buy a mea at a resteraunt that doest iterate the ingredients. In fact this is rather common.
@amolith Chances are you've never received an answer to that, shor tof a half-assed one. Recipies tend to be secret, they might tell you some of the ingredients but not every last one.
"Whats on this"... "A tomato sauce with onions", I assure you there is far more than tomatos or onions if they say such a thing. There is olive oil, basil, salt, pepper and whatever else.
Besides even if they wanted to tell you every last ingredient they probably dont know it. If they used can tomatoes I doubt they know all the preservatives and chemicals listed on the can.