What item is not used to set up the traditional side?

In the context of setting up a traditional side in the deli department, a knife is not typically utilized for the arrangement or presentation of the food items. The traditional side setup involves preparing and displaying items that are ready for customer service, which focuses more on presentation and serving rather than the cutting or slicing of ingredients.

A cutting board, serving platter, and dishwasher all play significant roles in the process. The cutting board is essential for preparing ingredients safely and efficiently before their presentation. The serving platter is directly involved in the actual display and serving of the food, showcasing it in an appealing way for customers. The dishwasher, while not directly involved in the setup itself, plays an important role in maintaining cleanliness and ensuring that available serving items are hygienic and ready for use.

Thus, the knife is more associated with the preparatory phase of food preparation rather than the setup phase for traditional sides, making it the correct answer in this context.