Roast Beef and Mushroom Sandwich

Method

1. In a small bowl, mix mayonnaise and Dijon mustard to make the dressing.
2. On one slice of sourdough bread, spread the dressing.
3. Layer roast beef, sliced portobello mushroom, spinach, and Munster cheese on the bread.
4. Top with the second slice of bread and serve.
5. For whole cuts, check a minimum internal temperature of 63°C (145°F), then rest for at least 3 minutes before serving.