How to Use Up All Those Hard-Boiled Eggs

Grated hard-boiled eggs and mayonnaise wrap around the potatoes that you don't even have to slice or dice — just crumble them with your hands once they've cooled. But you can use a knife to dice the potatoes if you wish, because you'll be using a knife anyway, to small dice the celery, thinly slice the scallions, and chop the parsley.