Preheat oven to 400°. Wash the cauliflower and shake it dry.
Cut the cauliflower in long slices, about ½ inch thick.
In a small bowl, whisk together the spices.
Spread steaks in a single layer in a large non stick baking sheet or a baking sheet lined with foil.
Coat the cauliflower steaks with the coconut oil on both sides and sprinkle the spice mix generously also on both sides.
Roast for 12 minutes and then flip slices over. Roast 12 minutes more. Remove from heat and serve immediately.