Ingredients

  • 3 lbs top sirloin roast
  • 4 garlic cloves, slivered
  • 1/4 cup light mayonnaise
  • 2 tablespoons prepared horseradish
  • 1/2 teaspoon dried sage
  • 1/2 teaspoon salt
  • 1/2 teaspoon pepper
  • 4 onions, thickly sliced
  • 1 cup beef stock
  • 1/2 teaspoon Worcestershire sauce
  • 1 tablespoon cornstarch

Method

  • With a sharp knife tip, cut about 40 slits all over roast.
  • Stuff each slit with a garlic sliver.
  • In a small bowl, whisk together mayonnaise, horseradish, sage, salt and pepper, brush all over roast.
  • Place onions in centre of roasting pan, place roast on top of onions.
  • Roast in 325°F oven until thermometer registers 160°F for medium, about 2 hours.
  • Transfer to cutting board and tent with foil, let stand for 10 minutes before carving.
  • Skim fat from pan juices.
  • Pour in beef stock and Worcestershire sauce, bring to boil, stirring scraping up brown bits.
  • Whisk cornstarch with 1 tablespoon water, whisk into pan and cook, whisking until thickened and glossy, about 2 minutes.
  • Strain and serve with beef.