Marcella Hazan 3 ingredient tomato sauce
Five ounces of butter seems like such an odd thing to add, but in it went.
The last ingredient is a large yellow onion, peeled and cut in half, then added to the pot.
I added a bit of salt as well.
After stirring everything together, and melting the butter, I reduced the sauce to a simmer and let it cook for a good 45 minutes.