Pizza Bianca with Spigarello, Roasted Cauliflower, and Red Onion

This is a pizza bianca (only Parmesan cheese was used) with roasted cauliflower, spigarello, red onion, a little bit of rosemary, olive oil, and sea salt that William made.  The spigarello was blanched and squeezed out since it is left over from the other night.  I rinsed the spigarello in some water in order to flatten and spread out the leaves and patted them dry with a paper towel.  The spigarello came out of the oven crispy, similar in taste and texture to kale chips.  There isn't much rosemary, so it is barely noticeable   I like my pizza drizzled with olive oil, especially where the crust meets the toppings.  This pizza is fairly lean, so it needs a good drizzle of olive oil and a sprinkle of sea salt.  Alternatively, it might also have been nice to try it with a little bit more Parmesan or with a mixture of Parmesan and fresh mozzarella.