Which ingredient is NOT part of the Roasted Turkey Club?

The Roasted Turkey Club is a classic sandwich typically composed of turkey, bacon, lettuce, tomato, and mayonnaise. While ingredients like mayo, bacon, and often avocado can be included depending on the recipe variations, blue cheese is not a common component of this particular sandwich.

Blue cheese is a strong-flavored cheese that is usually found in salads, dips, or other dishes but doesn't align with the traditional flavor profile of a Roasted Turkey Club. The other ingredients contribute to the sandwich's creamy and savory taste, whereas blue cheese introduces a distinctly different flavor that would not typically be associated with this sandwich. This makes blue cheese the ingredient that does not belong in the Roasted Turkey Club.