So you think you know how to Roast Beef? You haven't Roasted nothing until you've done it Patten-style.
If you scour the internet, you can most probably find a recipe on how to do a good roast, however it doesn't say anything about how your mum would do a roast.
There are so many many variations on this classic, my Dad does it completely differently from my Mother-In-Law for instance. But this, dear reader, is the control method.