1/2 cup mayonnaise (such as Kraft®)
3 1/2 tablespoons dill pickle relish, divided
1 1/2 teaspoons capers
2 tablespoons chopped onion, divided
1/2 teaspoon dried parsley flakes
1/2 teaspoon white sugar
Blend mayonnaise, 2 tablespoons relish, capers, 1 tablespoon chopped onion, parsley, and sugar in a blender until smooth. Stir remaining relish and onion into the blended mixture.
Transfer sauce to a bowl, cover with plastic wrap, and refrigerate at least 2 hours before serving.
Source : allrecipes.Com