Whole roasted cauliflower is a sight to behold and never fails to delight, especially when it’s topped with a verdant blend of herbs and pistachios. This version delivers a browned cauliflower that ends up soft enough — custardy almost — to serve with a spoon. And it all comes together in one pan, with water added right to the skillet to steam and soften the cauliflower while it roasts over caramelized onions. Sprinkling some Parmesan on top is a nice way to finish this dish.
