Wash and boil potatoes with skins on until tender.

Boil eggs until hard-boiled.

Dice the boiled potatoes and chop the boiled eggs.

Finely chop the onion.

In a mixing bowl, combine the diced potatoes, chopped eggs, chopped onion, celery salt, garlic salt, Worcestershire sauce, mustard, and mayonnaise.

Mix all ingredients well until evenly distributed.

Serve immediately or chill for later. Best served cold.