My work serves a salad Niçoise, we don't use the cos lettuce, and we use canned tuna (not as nice, I know). For most people who look at it, it is predominately a potato salad with some egg, tuna, tomato, olives, and green beans.

I had a customer order the Niçoise as, 'the potato salad.' I explained that it had tuna, she was fine with that. And later I overheard her complaining that there was too much potato...