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Pour the contents of both cans of whole peeled tomatoes into a large, heavy-bottomed pot or Dutch oven. Add the 1 1/2 sticks of unsalted butter and the 2 halved yellow onions to the pot.

Place the pot over medium heat and bring the sauce to a gentle simmer. Once simmering, reduce the heat to low, ensuring the sauce maintains a very gentle simmer. Cook, uncovered, for 1 hour and 15 minutes, allowing the flavors to meld and the onions to soften.

Carefully remove the softened onion halves from the sauce and discard them (or save them for another use, as they are quite flavorful).

For a smoother sauce, use an immersion blender to blend the tomato sauce directly in the pot until it reaches your desired consistency. Alternatively, you can leave it chunky for a more rustic texture.

Taste the sauce. At this point, it should be incredibly flavorful even without salt. Set aside while you cook the pasta.

Bring a large pot of generously salted water to a rolling boil. Add the pasta and cook according to package directions until it is al dente (slightly undercooked), reserving about 1 cup of the starchy pasta cooking liquid before draining.

Using tongs, transfer the al dente pasta directly from the boiling water into the simmering tomato sauce. Add the 1/2 cup of grated Parmesan cheese and 1 teaspoon of salt (or to taste).

Add a small amount of the reserved pasta cooking liquid, starting with 1/4 cup, and stir well. The starch from the pasta water will help emulsify the sauce and make it cling beautifully to the pasta. Add more pasta water, 1 tablespoon at a time, if needed to achieve a desired consistency.

Toss the pasta and sauce together until thoroughly combined and the pasta is evenly coated. Serve immediately, garnished with additional freshly grated Parmesan cheese, if desired.


Pour the contents of both cans of whole peeled tomatoes into a large, heavy-bottomed pot or Dutch oven. Add the 1 1/2 sticks of unsalted butter and the 2 halved yellow onions to the pot.

Place the pot over medium heat and bring the sauce to a gentle simmer. Once simmering, reduce the heat to low, ensuring the sauce maintains a very gentle simmer. Cook, uncovered, for 1 hour and 15 minutes, allowing the flavors to meld and the onions to soften.

Carefully remove the softened onion halves from the sauce and discard them (or save them for another use, as they are quite flavorful).

For a smoother sauce, use an immersion blender to blend the tomato sauce directly in the pot until it reaches your desired consistency. Alternatively, you can leave it chunky for a more rustic texture.

Taste the sauce. At this point, it should be incredibly flavorful even without salt. Set aside while you cook the pasta.

Bring a large pot of generously salted water to a rolling boil. Add the pasta and cook according to package directions until it is al dente (slightly undercooked), reserving about 1 cup of the starchy pasta cooking liquid before draining.

Using tongs, transfer the al dente pasta directly from the boiling water into the simmering tomato sauce. Add the 1/2 cup of grated Parmesan cheese and 1 teaspoon of salt (or to taste).

Add a small amount of the reserved pasta cooking liquid, starting with 1/4 cup, and stir well. The starch from the pasta water will help emulsify the sauce and make it cling beautifully to the pasta. Add more pasta water, 1 tablespoon at a time, if needed to achieve a desired consistency.

Toss the pasta and sauce together until thoroughly combined and the pasta is evenly coated. Serve immediately, garnished with additional freshly grated Parmesan cheese, if desired.
