Begin by preheating your oven to 425°F (220°C). To facilitate easy cleanup, line a large baking sheet with parchment paper.
Carefully remove the green leaves from the base of the cauliflower. With a sharp knife, slice the cauliflower head into ¾-inch thick steaks, yielding approximately 2-3 steaks from the central section. Any remaining florets can be set aside for roasting alongside the steaks.
In a small mixing bowl, combine the olive oil, turmeric, smoked paprika, garlic powder, sea salt, and black pepper. Whisk together until you achieve a smooth and cohesive marinade.
Using a brush, generously coat both sides of each cauliflower steak with the turmeric mixture, ensuring an even and thorough coverage. Arrange the coated steaks on the prepared baking sheet, taking care not to overcrowd them.
Roast the cauliflower steaks in the preheated oven for 20 minutes. After this time, carefully flip the steaks over using a spatula, and then return them to the oven for an additional 15-20 minutes. They should be golden brown and tender when done.
Once roasted to perfection, remove the cauliflower from the oven and drizzle the fresh lemon juice over the steaks. Allow them to rest for a few minutes before serving, enabling the flavors to meld beautifully.
Optional: If you're using tahini, now is the time to thin it out with a little water until you reach a drizzle-worthy consistency.
Serve the warm cauliflower steaks on individual plates, garnished with a sprinkle of freshly chopped parsley and a drizzle of tahini if desired, to create a delightful presentation.
Notes
Optional tahini can be served for added creaminess.