Gather all your ingredients measured out and ready to go for a seamless mixing process!
In a mixing bowl, add 1 cup of mayonnaise and 1 tablespoon of sour cream. Stir until smooth and well combined.
Add 1 tablespoon of white vinegar and 1 teaspoon of lemon juice to the mayonnaise and sour cream mixture. Blend well to incorporate.
Fold in 2 tablespoons of chopped pickles, 1 tablespoon of capers, and 2 teaspoons of Dijon mustard.
Season with salt and pepper to taste, mixing thoroughly to ensure even distribution.
Chill the tartar sauce in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.