Preheat oven to 400 degrees.: As the oven comes to temperature you should feel the anticipation of that reliable, steady heat that will finish the steaks while keeping them succulent. A properly preheated oven ensures the steaks cook evenly rather than slowly steaming, which robs them of crisp edges. You'll know the oven is ready when it reaches the target temperature and the air inside feels hot if you briefly open the door. A common mistake is placing the steaks into an underheated oven, which causes limp, pale results instead of the golden finish we want.
Slice the cauliflower into 1 inch thick flats or "steaks".: When you slice the cauliflower , listen for a firm, clean cut and look for intact florets bonded to the core, these make the most attractive steaks. Aim for even thickness so they cook uniformly, and keep a bit of core intact to hold each piece together. You may get a few loose florets; save them for roasting alongside the steaks. Avoid cutting steaks that are too thin because they can break apart during handling and may overcook, becoming mushy.
Brush each flat with 1 tbsp olive oil and sprinkle both sides with the seasonings.: As you brush the surface, watch the olive oil soak into the exposed florets and soften the texture slightly, which helps the spices stick. The oil helps the surface go from pale to glossy to richly browned while the spices bloom and release aroma. Season both sides so flavor penetrates through the thickness. One pitfall is under seasoning the underside, leaving the final bite bland, so be sure to flip and repeat.
Heat a cast iron or oven proof skillet over medium/high heat, add 1 tbsp olive oil and cook cauliflower steaks for 4 minutes or until golden.: As the skillet heats, it radiates intense, even heat that encourages sizzling and browning; you should see the oil shimmer and possibly faint wisps of smoke if the pan is hot enough. Lay the steaks down carefully and listen for an immediate sizzle, this sound indicates surface moisture is evaporating and caramelization is beginning. After a few minutes, check for deep golden patches along the edges. If you crowd the pan, you will steam rather than sear the steaks, so give them room to breathe.
Turn steaks over and place in the oven for 12-14 minutes or until fork tender.: Once flipped, the steaks will take oven heat to cook through evenly; inside they should go from firm to fork tender while the exterior continues to brown. You may notice a nutty, roasted aroma as the sugars in the cauliflower caramelize. Check tenderness by inserting a fork into the thickest part; it should meet little resistance but not be mushy. A frequent error is overcooking in the oven which leads to dry, grainy texture, so monitor closely toward the end of the time range.
Serve with chimichurri or pesto if desired.: At the point of plating, the steaks will be warm to the touch and emit a toasty, spiced perfume from the paprika and cumin . A bright, herbaceous sauce adds contrast and freshness that lifts the whole plate, creating a balance between rich crust and vibrant finish. If you skip a sauce, consider a squeeze of lemon to brighten flavors. Avoid drenching the steak in sauce, which can overwhelm the crisp exterior and mask the careful browning.