Cold Roast Beef with Horseradish Dressing

Ingredients

• Roast Beef and Potatoes

  • 1 1/2 lb (675 g) small baby potatoes
  • 3 tbsp (45 ml) olive oil
  • 1 top sirloin beef roast, about 2.2 lb (1 kg), tied
  • 2 tbsp Montreal steak spice
  • 2 tbsp (30 ml) Dijon mustard

• Dressing

  • 1/2 cup (125 ml) olive oil
  • 1/4 cup (60 ml) prepared horseradish
  • 1/4 cup (60 ml) white wine vinegar
  • 2 tsp (10 ml) Dijon mustard
  • 2 tsp (10 ml) maple syrup

• Toppings

  • 3 1/4 cups (115 g) watercress (see note)