This sauce is easy...ridiculously easy...fantastically easy! I'm not even going to post a recipe because it's that easy. The ingredients are: 1 can of San Marzano Tomatoes (whole peeled--28oz) 1 stick of butter, and 1 onion cut in half (outer skin removed). You put these three elements in a dutch oven (or pan, whatever you have) and let them simmer for about 45 minutes or until the onion is nice and soft and you can mash the tomatoes with the back of a wooden spoon.
For the final sauce you remove the onion (you use it for the onion juice) and you can puree the sauce or do as I did and just manually mash the tomatoes for a more rustic sauce. It has this lovely richness from the butter but it is flavorful and has depth; I don't know why something so simple tastes so great but it does.