Roast Beef and Caramelized Onion Sandwich

Ingredients

• 1 pound (450g) roast beef, thinly sliced 1 pound (450g) roast beef, thinly sliced
• 2 large onions, thinly sliced 2 large onions, thinly sliced
• 2 tablespoons (30ml) olive oil 2 tablespoons (30ml) olive oil
• 1 tablespoon (15g) butter 1 tablespoon (15g) butter
• 1 teaspoon (5g) sugar 1 teaspoon (5g) sugar
• 1/2 teaspoon (2.5g) salt 1/2 teaspoon (2.5g) salt
• 1/4 teaspoon (1.25g) black pepper 1/4 teaspoon (1.25g) black pepper
• 8 slices of crusty bread 8 slices of crusty bread
• 1/4 cup (60g) mayonnaise 1/4 cup (60g) mayonnaise
• 2 tablespoons (30g) prepared horseradish 2 tablespoons (30g) prepared horseradish
• 1 tablespoon (15g) Dijon mustard 1 tablespoon (15g) Dijon mustard
• Optional: lettuce leaves and tomato slices for garnish Optional: lettuce leaves and tomato slices for garnish

Nutrition

• Calories (kcal / KJ): 450 kcal / 1884 KJ
• Fat: 20g (Saturated Fat: 5g)
• Carbohydrates: 35g (Sugar: 6g)
• Protein: 30g
• Fiber: 4g
• Salt: 1.5g

Preparation

1. 1.
   Heat olive oil and butter in a large skillet over medium heat. Add the sliced onions and cook until they start to soften, about 5 minutes.
2. 2.
   Sprinkle sugar, salt, and black pepper over the onions. Reduce the heat to low and continue cooking, stirring occasionally, until the onions are caramelized and golden brown, about 30 minutes.
3. 3.
   In a small bowl, mix together mayonnaise, horseradish, and Dijon mustard to make the horseradish sauce.
4. 4.
   Toast the slices of crusty bread until golden and crisp.
5. 5.
   Spread a generous amount of horseradish sauce on one side of each bread slice.
6. 6.
   Layer the roast beef slices on top of the horseradish sauce on four bread slices.
7. 7.
   Divide the caramelized onions evenly among the four sandwiches, placing them on top of the roast beef.
8. 8.
   If desired, add lettuce leaves and tomato slices for extra freshness.
9. 9.
   Top each sandwich with the remaining four slices of bread, horseradish sauce side down.
10. 10.
    Cut the sandwiches in half diagonally and serve.

Treat your ingredients with care...

• Roast beef — Choose a lean cut of roast beef for a healthier option. If slicing the roast beef at home, make sure to slice it thinly against the grain to ensure tenderness.
• Onions — Use sweet onions, such as Vidalia or Walla Walla, for the best caramelization results.
• Crusty bread — Opt for a bread with a sturdy crust and soft interior, such as a baguette or ciabatta, to hold up to the sandwich fillings.
• Horseradish sauce — Adjust the amount of horseradish according to your preference for spiciness. Add more for an extra kick or reduce for a milder flavor.
• Lettuce and tomato — Choose fresh and crisp lettuce leaves and ripe tomato slices to add a refreshing element to the sandwich.

Tips & Tricks

• For added flavor, you can lightly toast the roast beef slices in a skillet before assembling the sandwich.
• If you prefer a warm sandwich, you can heat the assembled sandwich in a panini press or grill it on a stovetop griddle until the bread is crispy and the fillings are heated through.
• Customize your sandwich by adding your favorite cheese, such as Swiss or cheddar, to melt over the roast beef and onions.
• If you're short on time, you can use store-bought caramelized onions instead of making them from scratch.
• Leftover roast beef can be used in this sandwich, or you can roast a fresh beef roast specifically for this recipe.

Serving advice

Serve the Roast Beef and Caramelized Onion Sandwich warm or at room temperature. Accompany it with a side of crispy fries or a fresh green salad for a complete meal. Cut the sandwich in half diagonally for an elegant presentation.

Presentation advice

To enhance the presentation, you can garnish the plate with a sprig of fresh herbs, such as parsley or thyme. Serve the sandwich on a wooden cutting board or a rustic-style plate to highlight its homemade charm.