Roasting a whole head of cauliflower for dinner can present a dramatic moment equal to serving a whole roasted chicken. Each are browned and gorgeous in their own way. You can even "carve' the cauliflower at the dinner table as you would the roast chicken.
The cauliflower is smeared with a mayonnaise-mustard mixture, giving it fantastic flavor, as well as yielding the beautiful bronzing. I like the contrast of textures gained by adding toasted walnuts to the browned butter, offering great crunch against the soft flesh of the vegetable. The cauliflower can be served as a side dish, or as the main dish with a side of orzo pasta or rice.