A traditional spaghetti sauce is a sauce
(1) for which there is no known first cook,
(2) which is passed on orally,
(3) for which you don't have to pay any royalties if you cook it, and
(4) for which there are still new variants discovered each year.

The tomatoe sauce is just one possible traditional variant. My personal preference is spaghetti alla putanesca, that is spaghetti the whores' way, which is a very hot sauce indeed (I like to add pepperoni and sardines). It has led to the famous quote by the Italian cook Big Giordano Bruno (who knew better than any other cook what really hot meant):
"I've seen many different folks cook but I've never yet seen any whores cook."

Wolfgang (who actually likes and reads with great interest the many serious posts in this thread)