Rigatoni al Segreto (Rigatoni with Secret Sauce) - PantryLink Recipes

Ingredients

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