Prepare the Spice Mix: In a small bowl, mix together the salt, garlic powder, black pepper, paprika, and ground coffee.
Season the Steak: Rub the neutral-flavoured oil all over the tomahawk steak, then generously season it with the spice mix on all sides.
Cook the Steak: Place the steak into a smoker or oven preheated to 140°C (285°F) and cook until the internal temperature reaches your preferred doneness. I pulled mine at 44°C (111°F) for rare.
Rest the Steak: Once you’ve reached your desired internal temperature, remove the steak from the heat and let it rest for 5 minutes.
Sear the Steak: Heat your barbecue or grill to a high temperature. Sear the steak on both sides until you get a good colour and char. Remove from the grill, rest for another 5 minutes, then slice and serve.