Christmas side dishes for porchetta?

My porchetta has fennel seed (and fronds) in it. If yours does too a nice accompaniment would be Ina Garten's Potato-fennel Gratin. It is absolutely delicious and is available on the Foodnetwork site.

I think any sort of dark or bitter green salad would be very nice. This is my personal favorite—https://food52.com/recipes/18080-lacinato-kale-and-mint-salad-with-spicy-peanut-dressing—but I'm sure this one would be good too: https://food52.com/recipes/70899-joshua-mcfadden-s-bitter-greens-salad-with-melted-cheese