Rigatoni al Segreto (Rigatoni with Secret Sauce)

By Chef John

4.79 / 5

15min

55min

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4 tablespoons olive oil
1 cup diced onion
1 teaspoon salt plus more to taste
2 cloves garlic crushed (or more to taste)
1 pinch red pepper flakes
1 (28 ounce) can San Marzano (Italian) tomatoes blended smooth
½ cup water to rinse out can of tomatoes
1 (8 ounce) package rigatoni pasta uncooked
½ cup fresh basil leaves thinly sliced
4 tablespoons cold butter cubed
1 cup grated Parmigiano-Reggiano cheese plus more for serving