Argentine Spring Sandwich with Grilled Beef

Method

1. Season the beef with salt and pepper. Heat olive oil in a skillet over high heat and sear the beef for 3-4 minutes per side for medium-rare.
2. While the beef cooks, toast the bread slices. Spread mayonnaise and Dijon mustard on the bread.
3. Place the grilled beef on one slice of bread, then add mozzarella cheese, tomato slices, and mixed greens.
4. Top with the remaining bread slice and press gently. Serve immediately.
5. For whole cuts, check a minimum internal temperature of 63°C (145°F), then rest for at least 3 minutes before serving.