Start by chopping the onion, cornichons, and parsley into small pieces. The finer you chop them, the better the texture of your tartar sauce will be.
In a mixing bowl, combine the mayonnaise, lemon juice, Dijon mustard, distilled white vinegar, Worcestershire sauce, and cornichon juice. Stir with a whisk or spatula until smooth.
Add in the chopped onion, cornichons, capers, and parsley. Mix everything together until well combined.
Finally, add freshly ground black pepper to taste. Remember, you can always adjust the seasonings later if you prefer a bolder flavor.
For the best flavor, let the tartar sauce chill in the refrigerator for at least 30 minutes before serving. This will allow the flavors to meld beautifully.
