In this stunning, healthy cauliflower recipe, a head of cauliflower is cut into thick slabs then roasted until caramelized and served with chimichurri, a garlic-herb sauce. The cauliflower steaks make a fine accompaniment to actual steaks, or better still, serve them on their own as a vegetarian alternative to steak. Each head of cauliflower will provide 2 to 3 steaks from the center--the sides tend to crumble. For a truly show-stopping presentation, use the center portion of 2 heads and save the rest of the cauliflower for another recipe that calls for cauliflower florets.