How do you make a britannia joint?

To make a Britannia joint, start by seasoning a piece of meat, typically beef, with salt and pepper. Sear it in a hot pan to develop a crust, then transfer it to a roasting tray. Roast it in the oven at a moderate temperature until it reaches your desired level of doneness, usually around 20 minutes per pound for medium-rare. Let the joint rest before slicing to ensure the juices are retained.