Combine the base ingredients. In a mixing bowl, add 1 ½ cups mayonnaise and ½ cup sour cream. Stir until smooth and creamy.
Mix in the texture boosters. Fold in the chopped pickle, capers, and green onions, ensuring they are evenly distributed throughout the mixture.
Add the flavor enhancers. Stir in 1 ½ tbsp horseradish, 1 tbsp Worcestershire sauce, ½ tsp garlic powder, and ½ tsp onion powder. Mix thoroughly to blend the flavors.
Finish with dill. Sprinkle in 1 tsp dried dill (or fresh dill if using). Mix well, ensuring the dill is evenly incorporated.
Taste and adjust. Give the tartar sauce a taste and adjust seasonings as needed. You can add a pinch of salt, a splash of pickle juice for extra tang, or more horseradish for a spicier kick.
Chill before serving. Transfer the tartar sauce to an airtight container. Refrigerate for at least 30 minutes to allow the flavors to meld together.
Serve and enjoy! Use this creamy, flavorful tartar sauce as a dip for fried fish, shrimp, or calamari, or spread it on a fish sandwich for an extra layer of deliciousness.
