Preheat the oven to 180degC.
Tie up your lovely roast with some twine (as you can see I was never in the Girl Guides). Season well with salt and pepper. Then, brown it in a pan on high heat. You want a happy sizzle as you put the meat down!
Place the mirepoix on a roasting pan and place the beef on top of the vegetable mix, and stick the lot in the oven for at least 20-25 mins.
Brown the potatoes in a small pan with an unhealthy amount of butter and touch of salt. Because the Hubby was out with clients at dinner, I decided to simply use the spuds I was turning for practice. We usually have A LOT more potatoes than this!
Because I'd browned the potatoes on a non-stick pan, I transferred them to a small roasting pan before letting it join the roast.
Now, get on with making your jus. Drain the mirepoix of excess oil and place it in a small pot, along with a bouquet garni and beef stock. Bring to a boil, skimming off any oily or scummy bits. Strain it, then reduce to half. Season to taste.
For me, I was going for a rare to medium rare roast, so here's how it looked before plating: