The tomahawk cut is actually a ribeye steak left connected to the bone. In terms of optics, it’s a real showpiece, resembling the shape of an ax. But anyone who knows the phrase “tender at the bone” knows the real reason the bone is left in: it tastes magnificent.
Remove your steak from the refrigerator and allow it to warm up slightly to room temperature for about an hour.
Preheat oven to 250°F. Line a rimmed baking sheet with foil and place a wire rack over top. Pat steak dry and season all over with kosher salt and black pepper; place on prepared rack. Place in the oven and cook until an instant-read thermometer registers 115°F for medium-rare, 125°F for medium, or 135°F for medium-well, 40-55 minutes.
When steak is close to reaching desired doneness, heat oil in a large cast-iron pan over high heat.
Add steak and butter and cook for 2-3 minutes, until a deep brown crust is formed. Flip steak and cook another 2-3 minutes, or until internal temperature is 125°F for medium rare, 135°F for medium, or 145°F for medium-well.
Transfer to a platter to tent loosely with foil to rest for 10 minutes.
To serve, pile warm crab meat on top of tomahawk steak and drizzle with hollandaise sauce.
Hollandaise Sauce and Crab
Combine the egg yolks, lemon juice, pinch of salt and pepper in a glass measuring cup. Blend with an immersion blender until thick, frothy and lightened in color, about 30 seconds.
Melt 5 tablespoons of butter, covered in the microwave or in a small pot on the stove, until very hot.
With the immersion blender running, slowly stream the hot butter into the egg yolks until it’s fully combined. Blend a few extra seconds to make sure the sauce is thick and the butter is fully blended in. Taste and adjust seasoning if needed; set aside while you warm the crab.
Melt remaining tablespoon butter in a small skillet over medium heat. Add crab meat and a pinch of salt and cook a minute, until warmed through. Stir in chives.