cauliflower goes in raw.
no liquid in with the cauli, but liquid in moat, depending on what you are cooking as a main, iyswim. so maybe some white wine for a chicken.
so, chop cauli bits quite small - they have ot make a long flat-ish parcel to wind around the moat.
nice slab of butter (we use goat's butter, as dh is cow's milk intolerant, which is salted), and salt/pepper to taste.
fold up the foil as per cobb instructions (can never remember which way round the foil goes, but you need the reverse of normal use, so that the heat is absorbed rather than reflected - it says in the cobb book), and then pop it in the moat for 35 mins or so.
even if you get the timings hopelessly wrong, and end up with mushy cauliflower, it still tastes marvellous.
I am a cauliflower fan anyway, but this is one of the best ways of eating it ever
same method for asparagus, and even that tastes good (and normally I can take or leave asparagus)