Remove all of the leaves from the cauliflower, but make sure you don't damage the bottom (stalk) because we will need that to hold things together for us on the grill.
Starting from the top of the cauliflower (the top of the "tree"), use a large knife and cut 1 inches slices all of the way down through the stalk. This should give you 2 or 3 nice cauliflower steaks to grill and some chunks of florets to throw on the grill as well.
Preheat the grill to medium high heat.
Brush all sides of the cauliflower steaks and florets with olive oil and sprinkle with a generous amount of the Kosher salt and black pepper.
Place the cauliflower on the grill and grill with the lid closed for 5 - 7 minutes.
Turn the cauliflower and continue grilling for another 5 - 7 minutes on the other side.
These times are approximate obviously, we just want a nice char on each side (yummy) and grill until each grilled cauliflower steak and the florets are tender.