1. Begin your preparation at least one day ahead.
Season the beef with the salt and pepper, rubbing it into and all over the meat. Transfer it to a plate and leave uncovered in the coldest part of your fridge (the bottom shelf) for 24-48 hours.
2. Fire up your Ooni pizza oven.
Fire up your Ooni pizza oven. Aim for 120˚C (250˚F) on the stone baking board inside. You can check the temperature inside your oven quickly and easily using the Ooni Infrared Thermometer. It is important that the temperature doesn't climb much higher than this, so be sure to regulate the heat in the oven by adding small amounts of extra charcoal when required.
3. Place a sheet of foil inside a large roasting tray and sit the meat on it.
Gather the foil around it, leaving the top uncovered; you just want to protect the sides from the direct heat of the charcoal.
4. Place in your Ooni and cook for about 2 hours, until a meat thermometer inserted into the middle of the meat registers 54˚C (129˚F).
This will give you a medium-rare joint.
5. Once the meat is done to your liking, cover it with foil and kitchen cloths and set aside to rest in the tray for 30 minutes.
6. Meanwhile, load up your Ooni with plenty of charcoal and bring the temperature up to 350ºC (660ºF) or above.
At that point, remove the coverings from the meat and return the tray to the oven for a final searing. Turn the meat a few times to achieve an even colour and slight caramelisation. This shouldn’t take more than 5-10 minutes.
7. Serve and enjoy!.
