Chop the capers and dill pickles into small, uniform pieces.
Set them aside for later use.
In a mixing bowl, add mayonnaise and freshly squeezed lemon juice.
Mix until smooth.
Add the minced onion, sugar, black pepper, and salt to the mayonnaise blend.
Stir gently to combine the ingredients evenly.
Incorporate the chopped capers and dill pickles into the mixture.
Stir until the consistency is smooth and even.
Taste the sauce and adjust seasoning as needed.
Place it in the refrigerator for at least an hour before serving to let the flavors develop.