Roasted Beef Tenderloin with Caramelized Onions

Ingredients

• Roast

  • 2 teaspoons (10 ml) mustard seeds, crushed
  • 1 teaspoon (5 ml) coriander seeds, crushed
  • 1 teaspoon (5 ml) black peppercorns, crushed
  • 1/4 teaspoon (1 ml) ground cinnamon
  • 1 roast, about 3 lbs (1.4 kg) beef tenderloin, center cut or top sirloin
  • 2 tablespoons (30 ml) Dijon mustard
  • 4 onions, thinly sliced
  • 1/4 cup (60 ml) butter
  • Salt and pepper

• Sauce

  • 2 tablespoons (30 ml) cornstarch
  • 2 tablespoons (30 ml) water
  • 8 cups (2 litres) chicken broth
  • 2 cups (500 ml) Marsala wine or Pineau des Charentes
  • 2 tablespoons (30 ml) molasses
  • 1/2 cup (125 ml) 35% cream
  • 1/4 cup (60 ml) unsalted butter