Combine the ingredients. In a small mixing bowl, add the sour cream, prepared horseradish, mayonnaise, dijon mustard, chives, salt, and black pepper. Stir well to combine.
Serve the sauce. Transfer the sauce to a small serving bowl and top with extra chopped chives for garnish.
Notes
For a mild horseradish flavor: Begin with 2 tablespoons of the prepared horseradish and adjust the amount of horseradish to your liking.For more of a spicy kick: To achieve a spicier flavor, add more horseradish one teaspoon at a time, making sure to taste after each addition to reach your desired level of heat.