2 Cups tomatoes, in addition to their juices ( for example, a 28 - ounce can of San Marzano whole peeled tomatoes)
5 tablespoons butter
1 onion, peeled and cut in half
Step 1 - Combine the tomatoes. their juices, the butter and the onion halves in a saucerpan. Add a pinch or two of salt.
Step 2- Place over medium heat and bring to a simmer. Cook, uncovered, for about 45 minutes. Stir occasionally, mashing any large pieces of tomato with a spoon. Add salt as needed
Step 3 - Discard the onion before tossing the sauce with pasta. This recipe makes enough sauce for a pound of pasta