Steps
1. Season the beef slices with salt and pepper.
2. In a hot skillet, cook the beef for about 2-3 minutes on each side until browned and cooked to your liking.
3. While the beef is cooking, mix the mayonnaise and Dijon mustard in a small bowl.
4. Slice the sandwich roll in half and spread the mayo-mustard mixture on both sides.
5. Layer the cooked beef on the bottom half of the roll.
6. Top with shredded lettuce and sliced tomato.
7. Close the sandwich, cut it in half, and serve immediately.