Near the end of lunch, we were surprised to note an unusual preparation. It appeared that CCS was using a three part bun, with a single top but two layers of bottom bun.
Note the different coloration of what appears to be two types of bread.
Going back to the photo record, the differentiated underbun is clearly revealed in this earlier Zapruder-like photo.
Intentional or not? We could not confirm. It appeared that some in the group had a similar treatment, but other insisted they received single bun treatment.