The recipe calls for a little grated Parmesan to add to the broth and a little shaved Parmesan to top the dish when served. Lemon juice added just before serving really brightens it.
The arugula from my CSA was pretty big and pretty peppery.
I did not add the pasta. And it was delicious without it but I'm also sure it's delicious with it. Just before serving, add the lemon juice and stir in the arugula. It's really delicious and I may now be a converted fennel fan.
The recipe is on the Smitten Kitchen site.
https://smittenkitchen.com/2016/10/broken-pasta-with-pork-ragu/