Boil the egg, peel and let cool. Then chop finely. Set aside.
Mix the remaining ingredients in a bowl, and add the chopped egg.
Cover and refrigerate at least 30 minutes for the flavors to blend before serving.
Notes
Quick notes If you want really good flavor for this, use Homade Chili Sauce, and Heinz Limited Edition Tomato Ketchup Blended with Balsamic Vinegar or, even better, San Marzano Earthquake Ketchup. Both make it special. Variations You can omit the eggs if you don't want them. If you don't like capers, remove those. If you are sensitive, remove the horseradish, although it does not make the dressing very "hot".
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