Chef John lets you experience the great flavor of a New York restaurant's famous pasta dish. Use an immersion blender to blend a can of San Marzano plum tomatoes. Cook some diced onions in olive oil with some salt and some garlic. Then add some chili flakes and the pureed tomatoes and cook for an hour. Stir in cubed butter, basil leaves, and Parmesan cheese, and then mix in your cooked rigatoni. Add some more Parmesan and dig into a revelation of delicious pasta! Get Chef John's recipe for Rigatoni al Segreto (Rigatoni with Secret Sauce).