Prep your ingredients: Finely chop the dill pickles, capers, onion, dill, and parsley. The finer the chop, the better the texture – aim for pea-sized pieces to avoid chunky bites.
Combine the base: In a medium mixing bowl, add the mayonnaise, lemon juice, Dijon mustard, salt, and pepper. Whisk until smooth and well incorporated.
Add the mix-ins: Stir in the chopped pickles, capers, onion, dill, and parsley. Mix gently but thoroughly to distribute everything evenly.
Taste and adjust: Give it a quick taste. Add more lemon juice for extra tang, salt if needed, or a pinch of sugar if you prefer it slightly sweeter.
Chill (optional but recommended): Cover the bowl with plastic wrap or transfer to an airtight jar. Refrigerate for at least 30 minutes to let the flavors meld – this makes a big difference!
Serve: Spoon into a serving bowl and enjoy with your favorite dishes. That's it – your tartar sauce recipe is ready!