In a large saucepan, add 1 (28-ounce) can whole peeled tomatoes, 1 medium onion, and 5 tablespoons unsalted butter.
Bring the mixture to a simmer over medium heat. Reduce the heat to low and continue to cook uncovered for 45-60 minutes. Stir occasionally, mashing any large pieces of tomato.
Remove the onion. Discard the onion, or use it in another recipe!
Use an emulsion blender or mash any large chunks of tomato to reach the desired sauce consistency. Season with salt to taste, if needed. Serve over pasta and enjoy!
Notes
Storage Instructions
Refrigerator: Store leftover sauce in an airtight container in the fridge for 3-5 days.
To Reheat: Reheat the sauce over the stove until warmed through. Add a splash of water or chicken broth to the sauce to help thin it, if needed!
Freezer: The cooked and cooled sauce can be frozen in an airtight container for up to 1 month. Remove and discard the onion before freezing.