When the pan is very hot, add 25g/1oz ... roasting tray to the oven. Roast the potatoes with the beef for 30 minutes, or until they are starting to turn golden-brown and crisp.
And while cooking roast might be a little bit intimidating ... Sear all sides of the beef in the hot oil to brown (for about 15 minutes total). Move the meat to a plate and deglaze the bottom ...