Two experiences both from the restaurant I worked at in my teens...
the dishwasher was helping stir salad dressing in the kitchen, using his whole arm in the huge bin of dressing. I don't remember what kind of dressing it was.
A waiter was preparing a tableside Caesar salad and working so hard to impress the two young ladies he was making it for, he dripped sweat into the salad. They barely touched it.