1. Heat oven to 400 degrees F. Cut the cauliflower lengthwise, including the stalk, into 3/4-inch slices and place on a large baking sheet. It's okay if the slices overlap a bit. Drizzle with olive oil.
2. Roast for 25 minutes, or until the tops are lightly browned in places and the stems are easily pierced with a fork.
3. Whisk together the remaining ingredients and pour over the cauliflower to serve.