Freshly made caesar dressing turns a run-of-the-mill sandwich into something special.
In a small bowl, combine Parmesan, mayonnaise, lemon juice, and Worcestershire; season with salt and pepper. Spread on both bread slices.
Break lettuce into large pieces; layer half on 1 slice of bread. Top with turkey, remaining lettuce, and bread.
If storing overnight, top bread with lettuce first, then dressing (to keep sandwich from getting soggy).