Adapted from Marcella Hazan.
Puree a 28 oz can of tomatoes in your blender. Pour into a saucepan, adding a teaspoon of salt,a quarter teaspoon of sugar, a stick of butter, and a peeled onion, halved. Bring to a simmer and simmer for 30-40 minutes, stirring occasionally.. If it reduces too quickly, add a little water periodically.
Remove the onion. (I end up scraping the sauce off of the onion before tossing it.) Use whenever you are tempted by bottled sauces.
Simple and elegantly delicious.
