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Export 3 ingredients for grocery delivery
Step 1
Combine the tomatoes, their juices, the butter and the onion halves in a saucepan. 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.