Gather all the ingredients listed above. Having everything ready makes the process smooth and efficient.
In your mixing bowl, add the 1 cup of mayonnaise. This will serve as the creamy foundation of your tartar sauce.
To the mayonnaise, add the 1 1/2 tablespoons of dill pickle relish, 1 tablespoon of chopped white onion, 1 tablespoon of capers, and 1 tablespoon of lemon juice.
Using a whisk or spoon, mix all the ingredients together until they are fully combined. You want a smooth, even mixture without lumps.
Give your tartar sauce a quick taste. If you feel it needs more tang, add a bit more lemon juice. For a stronger flavor, consider adding more capers or relish according to your preference.
Transfer your homemade tartar sauce to an airtight container if you're not serving it right away. It can be kept in the fridge for up to a week.
