Allow beef to come up to room temperature. Place the beef in a roasting pan and rub with 2 tablespoons of olive oil and season with salt and pepper.
Preheat oven to 190°C.
Place the beef in the oven and roast for 40-60minutes, or until the internal temperature reaches 60°C when tested with a meat thermometer. Remove from oven, loosely cover with foil and rest.
While the beef is resting make the tonnato. Place the tonnato ingredients in a food processor or container of an immersion blender. Process or blend until smooth. Thin down with a little water if necessary.
To serve, thinly slice the beef and place on a serving platter. Top with dollops of tonnato, a drizzle of olive oil, salt, pepper, parsley leaves and capers.
