Start by slicing your baguette or French bread in half lengthwise. If you prefer a toasted sandwich, you can also cut it into smaller pieces for easier handling.
Place the cooked roast beef evenly on the bottom half of the bread. The amount should be around 3 oz, but feel free to adjust based on your appetite!
Next, generously pile on the baby arugula. This adds a fresh, peppery flavor that balances the richness of the beef.
Sprinkle the shaved Parmesan over the arugula. This will melt slightly if you choose to toast the sandwich, adding a creamy texture.
Finish off with a sprinkle of fresh cracked pepper to enhance the flavors. You can adjust the amount based on your preference.
Place the top half of the bread on your sandwich. If desired, you can grill or toast the entire sandwich for a warm, crispy finish.
Cut the sandwich into manageable pieces and serve immediately. Enjoy your Roast Beef Sandwich with Arugula and Shaved Parmesan paired with a side salad or crunchy chips for a perfect meal!