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In a large, heavy-bottomed pot, combine the two large cans of whole peeled tomatoes, 1 1/2 sticks of unsalted butter, and the two halved medium yellow onions.

Bring the mixture to a gentle simmer over medium heat. Once simmering, reduce the heat to low to maintain a gentle simmer.

Allow the sauce to cook uncovered for approximately 1 hour and 15 minutes, stirring occasionally to prevent sticking. The onions will soften and infuse the sauce with their flavor.

Once the sauce has cooked, use tongs to carefully remove the softened onion halves from the pot. You can discard them or save them for another use.

If you prefer a smoother sauce, use an immersion blender to blend the tomatoes to your desired consistency. Traditionally, the sauce is left chunky.

While the sauce is finishing, bring a large pot of generously salted water to a rolling boil. Add the tagliatelle pasta and cook according to package directions until al dente.

Before draining the pasta, reserve about 1 cup of the starchy pasta cooking liquid. Drain the pasta thoroughly.

Transfer the cooked tagliatelle directly into the pot with the tomato sauce. Add 1/2 cup of grated Parmesan cheese and kosher salt to taste. Stir well to coat the pasta evenly.

Add a small amount (starting with 1/4 cup) of the reserved pasta cooking liquid to the sauce and pasta mixture. Stir vigorously; the starch in the water will help emulsify the sauce, creating a richer coating for the pasta. Add more liquid if needed to achieve desired consistency.

Plate the pasta, topping with additional sauce and a final sprinkle of grated Parmesan cheese before serving immediately.


In a large, heavy-bottomed pot, combine the two large cans of whole peeled tomatoes, 1 1/2 sticks of unsalted butter, and the two halved medium yellow onions.

Bring the mixture to a gentle simmer over medium heat. Once simmering, reduce the heat to low to maintain a gentle simmer.

Allow the sauce to cook uncovered for approximately 1 hour and 15 minutes, stirring occasionally to prevent sticking. The onions will soften and infuse the sauce with their flavor.

Once the sauce has cooked, use tongs to carefully remove the softened onion halves from the pot. You can discard them or save them for another use.

If you prefer a smoother sauce, use an immersion blender to blend the tomatoes to your desired consistency. Traditionally, the sauce is left chunky.

While the sauce is finishing, bring a large pot of generously salted water to a rolling boil. Add the tagliatelle pasta and cook according to package directions until al dente.

Before draining the pasta, reserve about 1 cup of the starchy pasta cooking liquid. Drain the pasta thoroughly.

Transfer the cooked tagliatelle directly into the pot with the tomato sauce. Add 1/2 cup of grated Parmesan cheese and kosher salt to taste. Stir well to coat the pasta evenly.

Add a small amount (starting with 1/4 cup) of the reserved pasta cooking liquid to the sauce and pasta mixture. Stir vigorously; the starch in the water will help emulsify the sauce, creating a richer coating for the pasta. Add more liquid if needed to achieve desired consistency.

Plate the pasta, topping with additional sauce and a final sprinkle of grated Parmesan cheese before serving immediately.
