6 tablespoons ketchup
3 tablespoons canned cider vinegar
2 teaspoons Worcestershire sauce
2 teaspoons salt
4 tablespoons mayonnaise
salt and pepper to taste
Bring a large pot of salted water to a boil. Add ketchup, vinegar, Worcestershire sauce, salt, and pepper. Bring mixture to a bubbly boil. Reduce heat to low; simmer about 20 minutes, or until thickening. Beat mustard, mayonnaise, salt, mayonnaise mixture, and refrigerate until serving cold.