Summer has Started! Let's swap Potato Salad recipes

My wife makes the best potato salad I have ever consumed. She has no written recipe. It's made by taste. She has had requests to make it for graduations, weddings, etc because it is so good. All I can tell you is that it contains potatoes, hard boiled eggs, onions, and a mustard based sauce. The worse potato salad she ever made was still excellent.