01 -
Bring a large pot of heavily salted water to a boil.
02 -
Heat a 3-quart stainless steel sauté pan over medium-high heat. Add enough olive oil to coat the bottom. Add the sausage, breaking it apart into smaller pieces with a wooden spoon. Season with a pinch of salt and cook until browned, about 5 minutes. Transfer to a plate using a slotted spoon.
03 -
Reduce heat to medium and add butter. Once melted, add onion and fennel. Cook for about 8 minutes until caramelized and tender, stirring often. Season with a good pinch of salt.
04 -
Drop the pappardelle into the boiling water, stir well, and cook to "al dente" according to package instructions.
05 -
Add garlic to the onions and fennel, cooking for 30 seconds. Stir in tomato paste and Calabrian chili paste, cooking for another minute. Pour in white wine and simmer for 2 minutes.
06 -
Add tomato purée, heavy cream, oregano, and browned sausage. Retrieve 1 cup of starchy pasta water and add to the sauce. Stir well to combine. Bring to a bubble, reduce heat to medium-low, and simmer for about 5 minutes, stirring occasionally.
07 -
Drain pasta and return to the large pot. Pour in sauce and toss to combine. Gradually add parmesan cheese, stirring until it melts and the sauce clings to the pasta. If needed, adjust consistency with more pasta water or additional heat.
08 -
Season with salt to taste. Plate the pasta with freshly cracked black pepper and additional parmesan cheese on top.