I was not a fan of this recipe... I found the radicchio got slimy and the garlic didn't really come through over the general bitterness of the veg. I may give it another shot with a tighter head of radicchio and more garlic.
We have grown radicchio the past two years and think this is an outstanding recipe-don't understand the negative review. I did not use anchovies (did not have any) but did use fresh oregano. Makes a colorful vegetable plate coupled with roasted green beans and sauteed yellow squash with cherry tomatoes.