Step 1 of 6

Roast the beef and potatoes

Heat the oven to 400°F. Roast the beef joint and the potatoes for about 45 minutes, checking the potatoes now and then so they don't overcook, until the thickest part of the beef reads 145°F. Lift the beef out, cover it loosely with foil and leave it to rest for at least 15 minutes before slicing — resting keeps it juicy and frees the oven up for the Yorkshire puddings.

— Roasting time varies with the size of the joint and how you like it cooked — a meat thermometer is the reliable guide.