Begin by preparing all the necessary ingredients for Long John Silver’s tartar sauce. Chop fresh dill, dice onions, and pickles into small pieces to ensure a harmonious blend of flavors in every bite. Set aside. In a medium mixing bowl, combine the chopped fresh dill, diced onions, mayonnaise, lemon juice, salt, dill pickles, black pepper, and diced pickles. Stir all the ingredients until they are well combined, creating a creamy and flavorful base for your tartar sauce.