Roast Beef and Horseradish Sandwich

• 4 crusty rolls (e.g. kaiser or ciabatta)
• 1 lb deli roast beef, thinly sliced
• 2 tbsp prepared horseradish
• 1/4 cup mayonnaise
• 1 cup fresh arugula
• 1/2 red onion, thinly sliced

Instructions

1. 1

   In a small bowl, whisk together the mayonnaise and prepared horseradish until smooth. Adjust the horseradish amount to your preferred spice level.

2. 2

   Split the rolls in half. Optional: lightly toast the rolls for added crunch.

3. 3

   Spread a generous layer of the horseradish mayo on both top and bottom halves of each roll.

4. 4

   Layer the roast beef slices on the bottom half of the rolls.

5. 5

   Top the beef with thinly sliced red onions and a handful of fresh arugula.

6. 6

   Place the top half of the roll on the sandwich and serve immediately.