Rutabagas have become one of my favorite vegetables since I've been on IP.
I slice them and bake them in a single layer on a cookie sheet with evoo, salt, and pepper. Bake at 375 15 minutes, then flip them and bake another 10 minutes. YUM! I add more salt and pepper after flipping.
Lately I've been adding a little sliced zucchini, red and green pepper strips, and cauliflower. If I do that, I eat less rutabaga - or spread it out over two days. They are a little high in carbs, but they are a staple veggie of mine. I have one about every other (or every third) night.