Roast beef sirloin with seeded mustard

The seeded mustard gives this beef roast a wonderful topping, the beef stays succulent and juicy, and the mustard adds a mild, yet tasty flavour.

Ingredients (serves 6)

  • 1½ kg piece sirloin/porterhouse
  • ½ cup seeded mustard
  • mixed green salad to serve


  1. Preheat oven to 200ºC. Brush the beef roast lightly with oil. Season it well with ground pepper and salt. Rub the pepper and salt into the roast.
  2. Place the beef on a rack in a roasting dish. Add a little water to the roasting dish (about ½ cup). Spread the seeded mustard over the top of the beef roast.
  3. Roast for 60 minutes for rare, 75 minutes for medium and 90 minutes for well done. For ease and accuracy use a meat thermometer.
  4. Remove the beef, cover loosely with foil and allow it to rest for 20 minutes before carving. Serve the beef roast with salad.

Essential Tips

  • Judging your roast’s degree of doneness using a meat thermometer. The internal temperature of the meat should be: Rare – 55-60ºC, Medium – 65-70ºC, Well done – 75ºC.
  • You can also use tongs to test the roast’s doneness. Gently prod or squeeze the roast – rare is very soft, medium rare is soft, medium is springy but soft, medium well is firm and well done is very firm.
  • Placing the roast on a rack in the roasting dish helps the beef to brown evenly.