Roast for 20-30 minutes, then open the oven and simply shake the baking pan and turn cauliflower around.
Let the cauliflower roast for 15 to 20 more minutes. Shake the baking/roast pan again and turn the oven on the broiler (high) just for a minute or so. Stay close, and try not to burn cauliflower. This also depends on how well done you want your cauliflower. I like it this way.
This could be served as a side dish. Pair it with rice, chicken or fish. You can make a soup with roasted cauliflower.