Mustard Roasted Cauliflower with Roasted Red Pepper Sauce | Vegan and Gluten Free. Cauliflower is tossed in a spicy brown mustard and roasted until soft and caramelized, then finished with a drizzle of creamy toasted walnut and red pepper sauce. It makes the perfect side dish! | thecuriouschickpea.com #vegan #cauliflower