Cut off the stem of the cauliflower and place in a Dutch oven. Some people like to keep the stem on for aesthetic purposes. The lid of my Dutch oven wouldn't fit if I didn't cut it off. Although it's entirely optional.You can alternatively wrap the cauliflower in aluminum foil.
Mix the rest of the ingredients together in a small bowl. Drizzle over the cauliflower, making sure to coat it completely.
Add the lid and roast for 45-60 minutes, or until tender. The time will vary slightly depending on the size of the cauliflower.