Cauliflower Espuma with Toasted Hazelnuts and Citrus Shavings

So, what do you do with leftover cauliflower soup? You turn it into a foam. It was a nice light cup of cauliflower foam with the hazelnuts to add some crunch and the zest for a kick. I like to dry out my citrus zest when I use it as a garnish because it's easier to work with and falls where you want it to and still retains the flavor.