Leftover Radicchio Casserole

So I made radicchio as part of Thanksgiving, with onion, dried cranberries and a balsamic dressing.  Unfortunately it was a little too bitter for people, so I ended up with a lot of leftovers.  Did a little scoping out around the Internet and came up with this.

Radicchio, chickpea pasta, a little more onion, butter, a dollop of sour cream, and cheese.

Cooked the pasta to al dente, mixed it all up

Grated some cheese on top and into the oven.

According to the Internet this will mellow out the bitterness.   So we shall see.

What are your favorite radicchio applications?