Which restaurant are you referring to?
For TS: At Le Cellier, they list "Pizza with mozzarella and diced chicken (optional), served with veggies and brown-sugar apples".
For CS: At Cantina de San Angel, they list "grilled chicken and cheese quesadilla, tortilla chips and a small soft drink".
So generally, they do list the side, if they're included. If it isn't listed, I'd plan on having to pay extra for it.