Take the presa out of the refrigerator about 60 minutes before cooking, so it is not too cold when cooked.

Season the meat with salt and pepper on both sides.

Heat a pan with oil. When the pan is hot, add the butter.

Brown the presa on both sides.

Place the roast in an ovenproof dish. If you have a meat thermometer, insert it into the thickest part of the meat.

Place the meat in a preheated oven at 180 degrees Celsius (356 degrees Fahrenheit) without fan for about 20 minutes, or until it has a core temperature of 56 degrees Celsius (133 degrees Fahrenheit).

Take it out and let it rest for 10 minutes.

Cut the roast into thin slices.