Place the cauliflower on a cutting board and slice it into ¾- to 1-inch thick “steaks.” You’ll typically get 2–3 large steaks; save the remaining florets for another recipe.
In a small bowl, whisk together the oil, lemon juice, garlic, onion powder, oregano, paprika, salt, and pepper.
Brush both sides of each steak with the marinade.
Heat a gas grill to medium-high (around 400°F). Make sure the grates are clean and lightly oiled to prevent sticking.
Place the cauliflower steaks directly on the grill. Cook for 5–7 minutes per side, until the cauliflower becomes tender and has grill marks without burning.
Remove from the grill, squeeze a little extra lemon juice and garnish with fresh herbs before serving.
Notes
Storage: Kept in an airtight container in the fridge, the cauliflower will keep for up 3 days. I'd reheat it in the microwave until warmed through, about 1-2 minutes.