Keys to a better egg salad: perfectly cooked eggs, a touch of acidity, and crunch.
Combine eggs, mayonnaise, lemon juice, celery, scallions, and parsley in a medium bowl. Using your hands, squeeze eggs through your fingers, mixing contents of bowl until reduced to desired consistency; alternatively, smash and mix with a firm whisk. Season generously with salt and pepper. Serve as sandwiches with sliced radishes, lettuce, and bread, or as desired.