I’d even tell you the recipe if I had time. Good thing it’s simple. Preheat your oven to something like 400ºF/200ºC. Toss cauliflower florets and plain white button mushrooms in oil, with a bit of salt, a teaspoon or so of freshly cracked coriander seeds, and some paprika (to taste — I love the stuff, so maybe I better not advise you on this one). Shove in the oven for 30 minutes or so. When the cauliflower starts to look golden, grate a healthy portion of gruyere over all of it, return to the oven until the cheese melts, and eat.
All of it.
In one sitting.