I usually eat broccolini or kai-lan rather than broccoli rabe, but I believe they are similar. Most recently, I just blanched and sautéed it, and served with duck breast, mashed potatoes, and a cherry/port wine sauce (and roasted cherries). I used it because I wanted a counterpoint to the rest of the dish, but it went surprisingly well with the cherries. But my favorite way to eat it is on pizza. I blanch it ahead of time for a couple of minutes, dry it, and put it on the pizza before it goes into the oven. Either with a tomato sauce, mushrooms, spanish (dry) chorizo, and cheese; or with caramelized onions (in lieu of sauce), manchego, and parmesan cheese.