Begin by trimming the leaves and core from the cauliflower head, then place it on a cutting board.
Using a sharp serrated knife, slice the cauliflower into four 1-inch thick steaks, aiming for even cuts that include some of the florets and stem for stability.
Preheat your oven to 200°C (390°F) and place a large skillet or cast iron pan over medium-high heat, adding about 2 tablespoons of olive oil and letting it warm until shimmering and fragrant.
Carefully place the cauliflower steaks in the hot pan, pressing gently to ensure good contact. Sear for 3-4 minutes on each side until they develop a deep golden-brown crust and smell nutty.
Once both sides are nicely browned, transfer the skillet to the preheated oven and roast for an additional 10-15 minutes, until the cauliflower is tender when pierced with a fork and edges are crispy.
Remove the skillet from the oven, squeeze fresh lemon juice over the steaks, and sprinkle with salt and chopped herbs for brightness and flavor.
Let the cauliflower rest for a few minutes, then serve warm, garnished with additional herbs if desired, and enjoy the smoky, satisfying flavor and crispy texture.