Preparation: Take the tomahawk steak out of the refrigerator and let it temper at room temperature for about 30 minutes to an hour.
Season the Steak: Season the steak with salt and pepper all over.
Fry the Steak: Heat a pan with olive oil and fry the steak until golden all over, about 3 minutes on each side, including the edges.
Add Butter and Aromatics: Add a dollop of butter to the pan along with rosemary and garlic cloves to infuse the fat with flavor.
Oven Roasting: Transfer the steak to a preheated oven at 200 degrees Celsius with convection and roast for 6 minutes. Take it out, let it rest for 6 minutes, then roast for another 6 minutes and finally let it rest for 10-15 minutes outside the oven.
Resting the Meat: After the final oven session, let the steak rest for about 10-15 minutes without covering it to prevent overcooking.
Serving: Slice the rested steak and serve.