Roast Beef and Caramelized Onion Sandwich Roast Beef and Caramelized Onion Sandwich

Author: Canadian Living

Even though the kitchen often includes different types of sandwiches in the cooler for lunch, this hearty bistro-style one is requested every day.

  • Portion size 8 servings
  • Credits : Canadian Living Magazine: February 2008


Carmelized Onions:
Horseradish Mayonnaise:


Roast: Place roast on rack in roasting pan; pour in enough water to come 1/4 inch (5 mm) up side of pan. In small bowl, whisk together garlic, mustard, oil, Worcestershire sauce, salt and pepper; brush all over roast.

Roast in 500°F (260°C) oven for 25 minutes. Reduce heat to 275°F (140°C); roast for 50 to 65 minutes or until meat thermometer reads 140°F (60°C) for medium-rare, or 155°F (68°C) for medium. Transfer to cutting board; tent with foil and let cool. Thinly slice against the grain.

Caramelized Onions:
In large skillet, melt butter with oil over medium-low heat; cook onions, salt and pepper, stirring occasionally, until tender and golden, about 45 minutes.

Horseradish Mayonnaise:
In small bowl, whisk mayonnaise with horseradish. (Make-ahead: Refrigerate roast, onions and mayonnaise in separate airtight containers for up to 24 hours.)

Cut baguettes lengthwise in half; brush cut sides with horseradish mayonnaise. Top bottoms with half each of the roast beef, cheese, roasted peppers, caramelized onions and salad greens; sandwich with tops of baguettes. Cut each crosswise into quarters.

Nutritional facts Per serving: about

  • Sodium 987 mg
  • Protein 33 g
  • Calories 551.0
  • Total fat 24 g
  • Cholesterol 70 mg
  • Saturated fat 8 g
  • Total carbohydrate 49 g


  • Iron 29.0
  • Folate 52.0
  • Calcium 11.0
  • Vitamin A 16.0
  • Vitamin C 57.0
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Roast Beef and Caramelized Onion Sandwich